cleanup: improve macro hygiene (#79)

* cleanup: improve macro hygene

* chore: bump versions

fix: free parameters to host functions when using the `host_fn` macro (…

…#77)

* fix: add ManagedMemory to automatically free host function parameters

* chore: bump version to 1.4.0

chore: bump version to 1.3.0 (#68)

chore: bump versions for 1.2.1 release (#62)

chore: bump to 1.2.0 for release (#56)

chore: bump versions for 1.1.0 release (#50)

feat: update to include rust-protobuf, bump version (#44)

Merge pull request #42 from extism/release-1.0.0

release: 1.0.0

Merge pull request #39 from extism/release-1.0.0-rc1

Release 1.0.0 rc1

chore: use `extism:host/env` namespace (#36)

* chore: use extism:env namespace

* cleanup: rename namespaced functions

* fix: proc macro

* chore: use extism:user namespace by default for user-defined host functions

* cleanup: fix host_fn attr

* chore: bump version

* fix: use extism:host/user instead of extism:user

* fix: use extism:host/env and extism:host/user

* chore: clippy

* chore: fix ci test