Description

This PR refactors the framework to be more compatible with TeaVM while also not breaking the other platforms.

It does the following:

• Rework the audio system to not include gdx-miniaudio in the core module, since miniaudio is a native C-based library and it currently isn't support for TeaVM (yet).
• Add a Gradle plugin to make development much easier for web game development. It automatically creates an index.html file, a flixelgdx {} extension block to customize your web game, and much more!
• Remove Box2D, as developers can add it themselves if they want to. They should use the native AABB system FlixelGDX provides.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor / Optimization
• Other (please specify in description)

Checklist

• My PR targets the develop branch, not master/main.
• My code follows the code style of this project (if any code was added or changed).
• I have performed a self-review of my own code (if any code was added or changed).
• I have commented my code, particularly in hard-to-understand areas (if any code was added or changed).
• My changes pass all automated build checks.
• I have updated the documentation accordingly (if applicable).
• I have added tests that prove my fix is effective or that my feature works (if any code was added or changed).

Screenshots / Evidence (if applicable)

Add screenshots or logs to help explain your changes.