Refactors `KvParser` to accept some expressions, as long as they don't
contain a comma at the top level outside any pair of `[]`, `()` or `{}`.

Also tightens up spans in error messages quite a bit.

203: Make `get` and `set` arguments take identifiers instead of strings r=Bromeon a=ttencate

Refactors `KvParser` to accept some expressions, as long as they don't
contain a comma at the top level outside any pair of `[]`, `()` or `{}`.

Also tightens up spans in error messages quite a bit.

Prelude for #199.

Co-authored-by: Thomas ten Cate <ttencate@gmail.com>

205: Implement #[init(default = ...)] annotation r=Bromeon a=ttencate

Fixes #199

Co-authored-by: Thomas ten Cate <ttencate@gmail.com>

…engine

Add `Mul<X>` impls for `Transform2/3D` for the new types
Add `min/max` functions for `Vector2/3`

180: Add basic impls of `Rect2`, `Rect2i`, `Aabb`, `Plane` r=Bromeon a=sayaks

- adds basic impls of `Rect2`, `Rect2i`, `Aabb`, `Plane`, so that every function/operator is usable (though many through `InnerX`)
- adds `Mul<X>` impls for `Transform2/3D` for the new types 
- adds `min/max` functions for `Vector2/3/4`

i did not add `Mul<Transform2/3D>` for these types because they are actually kinda odd in how they work in godot. We could consider adding them later but it seems there are some outstanding issues in godot related to them (such as godotengine/godot#71035) so it'd probably be good to wait and see if anything is changing there. 

min/max is there mainly to make the implementation of `Transform2D * Rect2` and `Transform3D * Aabb` cleaner. But are convenient functions to have in general.

Co-authored-by: Lili Zoey <lili.andersen@nrk.no>

…ivate)

Rename opaque pointer types to highlight their private nature.
Needs an update in packed_array.rs because it accidentally uses private implementation details.

Also update artifacts repo + branch version to "4.0.1"

…ic analysis)

A directory /.generated in the repo root seems to _mostly_ work, but on CLion it needs an extra "Cargo sync" in fresh/cleaned projects.
This creates extra friction that a crate-local `gen` directory doesn't have. Maybe reconsider this once IDEs handle things better.

… job; disable version r/w

211: Prebuilt Godot artifacts r=Bromeon a=Bromeon

Closes #12 
Closes #107 

From now on, gdext by default fetches pre-generated versions of these files, published in the [`godot4-prebuilt`](https://github.com/godot-rust/godot4-prebuilt) repo:
* `extension_api.json` (from Godot binary)
* `gdextension_interface.h` (from Godot binary)
* `gdextension_interface.rs` (through bindgen -- currently supports 3 platforms)

This has several benefits:
1. Significantly fewer dependencies, as bindgen is no longer needed, and thus smaller compile times.
2. Most CI jobs no longer need the Godot binary (clippy, test), speeding up CI _in addition_ to (1).
3. It's possible to change the Godot API behind gdext without manually rebuilding the artifacts.
4. Easy comparison between the Godot APIs of different released versions.


### Using a custom Godot binary

It is still possible to generate those files locally like before, through the use of the `custom-godot` feature on the `godot` crate.

This is necessary for any platform/configuration different from the 3 main supported ones (because bindgen generates different Rust bindings), as well as any in-development or modified Godot versions.


### Changing the Godot release

By default, the latest Godot release is used as input to gdext. Switching between different Godot versions is easily possible, although a bit cumbersome.

If you want to use an older version `4.0`, add this to your **workspace** (not sub-crate) `Cargo.toml`:
```toml
# We need to trick Cargo into seeing a different URL; rust-lang/cargo#5478
[patch."https://github.com/godot-rust/godot4-prebuilt"]
godot4-prebuilt = { git = "https://github.com//godot-rust/godot4-prebuilt", branch = "4.0"}
```
We're looking into ways to simplify this. In a crates.io release (#2), we would need to rethink this anyway, mapping Godot versions to Rust release versions (which is not trivial).

Co-authored-by: Jan Haller <bromeon@gmail.com>

Fixes #190

Some node methods are expected to return values. The corresponding
virtual methods, however, do not reflect that.

For instance, this is the virtual method `Node.get_configuration_warnings` before this commit:

```rust
fn get_configuration_warnings(&self) {
    unimplemented!()
}
```

This is the same method with this commit:

```rust
fn get_configuration_warnings(&self) -> PackedStringArray {
    unimplemented!()
}
```

This commit makes
`godot_codegen::clas_generator::make_function_definition` and
`make_return` aware of virtual method. It also adds a test making sure
we can call a virtual method that has a return value.

207: Add return values when generating virtual methods r=Bromeon a=jbarnoud

Fixes #190

Some node methods are expected to return values. The corresponding virtual methods, however, do not reflect that.

For instance, this is the virtual method `Node.get_configuration_warnings` before this commit:

```rust
fn get_configuration_warnings(&self) {
    unimplemented!()
}
```

This is the same method with this commit:

```rust
fn get_configuration_warnings(&self) -> PackedStringArray {
    unimplemented!()
}
```

This commit adapts what I think is the relevant code from
`godot_codegen::class_generator::make_method_definition` into `make_virtual_method`.

Note that I am very unfamiliar with most of the code I had to touch here as well as with the project.

Co-authored-by: Jonathan Barnoud <jonathan@barnoud.net>

217: check.sh: find Godot 4 executable when available as `godot` r=Bromeon a=yannick-was-taken

# The Issue

Some package managers (Arch Linux) install Godot 4.x as `godot` in the PATH. This is currently not correctly dealt with by check.sh, requiring the user to set GODOT4_BIN manually.

# The Solution

If `godot` is available, `check.sh` now inspects the version of that Godot installation, and if 4.x, accepts it gladly, removing the need to manually set GODOT4_BIN.

# Detail

The version check applies the regex `^4\.` to the version returned by `godot --version`. An example version (the one available in Arch Linux's community repo) is `4.0.1.stable.arch_linux`.

Co-authored-by: yannick-was-taken <yannick-was-taken@posteo.de>

215: Contribution guidelines, update `.gdextension` configurations r=Bromeon a=Bromeon

Elaborates the contribution process, documents `#[itest]` and unifies the `.gdextension` library entries.

Fixes #208.

Co-authored-by: Jan Haller <bromeon@gmail.com>