Add mouse keybind fix

[decce6]

Previously, if a keybind is bound to a mouse button, the keybind is not triggered until the next keyboard input. This was a flaw in Forge's design in 1.12.2. This PR resolves this issue by firing an additional InputEvent.KeyInputEvent event on mouse input.

Vanilla:

PR:

[what-the-diff]

PR Summary

• Introduced a new Mouse Keybind Handler: A new logic component was developed, named as UTMinecraftMixin.java. Its role is to manage keybinds when using the mouse. Essentially, it interweaves custom code into the main mouse handling function to trigger equivalent keyboard events when mouse activity is detected.

• Upgraded Existing Configuration Feature: The configuration class, known as UTConfigBugfixes.java, has been enhanced with a new option, utMouseKeybindFix. This permits users to turn on or off the newly implemented mouse keybind fix simply with a restart of the Minecraft game.

• Improved Plugin Loader: A modification was made to the UTLoadingPlugin.java plugin loader, incorporating the new mixin (mouse keybind fix) into the plugin's mapping. This ensures the new feature is correctly registered and loaded when the game starts.

• Added a Configuration File for the Mixin: A new configuration file called mixins.misc.mousekeybind.json was added to set up parameters for the mixin. This includes details such as the mixin package, reference map, compatibility, and the instruction to load the UTMinecraftMixin class that was supplemented.