Multi-arch patching support

[ViRb3]

Introduces multi-arch patching support, so unsupported architectures can have their libraries swapped with fixed versions. Initially implements support only for macOS arm64 (M1), but is easily extensible for more. The PR also brings some changes to the docs and tooling to allow new contributors to get started more easily. The allow/block list approach for lwjgl has also been replaced with a generic algorithm that will find the newest variant with all required native libraries.

The M1 libs come from ManyMC's meta: https://github.com/MinecraftMachina/meta-multimc-arm64/blob/5723d4fd60e4ef7ed6c78f1fef29f01c4ad0ecca/org.lwjgl3/3.3.1.json

Check out the generated meta here: https://github.com/ViRb3/meta-polymc. For some reason, the "auto choose lwjgl variant" commit ends up replacing the suggested lwjgl version for 1.14 pre-release: https://github.com/ViRb3/meta-polymc/commit/b1e9f22837f2e3b7963d36c600d7e04c6719bd0a, but this may be okay. Should investigate. This PR won't work with the launcher yet, since rules with os architecture suffix are not supported yet. Something like PolyMC/PolyMC#514 is necessary.

The general idea is to replace all necessary libs using rules that have an architecture suffix on the os property:

     {
         "downloads": {
             "artifact": {
                 "sha1": "9fab79a2822f493b194c81f5c92d3466abc28f27",
                 "size": 10810,
                     "url": "https://libraries.minecraft.net/com/mojang/text2speech/1.10.1/text2speech-1.10.1.jar"
                 }
         },
         "name": "com.mojang:text2speech:1.10.1",
+        "rules": [
+            {
+                "action": "allow"
+            },
+            {
+                "action": "disallow",
+                "os": {
+                    "name": "osx-arm64"
+                }
+            }
+        ]
     },
+    {
+        "downloads": {
+            "artifact": {
+                "sha1": "f378f889797edd7df8d32272c06ca80a1b6b0f58",
+                "size": 13164,
+                "url": "https://libraries.minecraft.net/com/mojang/text2speech/1.11.3/text2speech-1.11.3.jar"
+            }
+        },
+        "name": "com.mojang:text2speech:1.11.3",
+        "rules": [
+            {
+                "action": "allow",
+                "os": {
+                    "name": "osx-arm64"
+                }
+            }
+        ]
+    }

[Scrumplex]

Mojang chose to ignore the whole architecture stuff and just ship natives for an OS no matter the actual arch. So macOS will download both x64 and arm64 natives.
I would propose copying that solution. Though this will require changing the layout of the natives jars

[Scrumplex]

This is how new natives archives look now:

[Scrumplex]

The reason we only "support" Docker is because of some weirdness when running this on different machines. Some machines produce different output, so the Docker container is there to minimize differences in the environment.

[Scrumplex]

Closing this in favor of #16