Implement Fast Fly Block Breaking tweak

[atferrys]

Allows breaking blocks at normal speed while flying. Disabled by default.

This tweak deprecates FastFlyBlockBreaking.

[what-the-diff]

PR Summary

• New Feature Addition - Fast Fly Block Breaking
  This feature allows players to break blocks at their regular speed while they are flying. It significantly enhances the gaming experience by removing the slowdown usually experienced when players attempt to break blocks in flight mode.

• Documentation Update
  The README document has been updated to include a brief explanation about the Fast Fly Block Breaking feature, providing users a better understanding of its functionality.

• Configuration Option Added
  A new configuration setting, utFastFlyBlockBreakingToggle has been introduced in UTConfigTweaks.java. This setting allows players to enable or disable the Fast Fly Block Breaking feature as per their preference.

• Game Loading Plugin Update
  The file UTLoadingPlugin.java has been updated to integrate the new feature within the loading procedures of the game. This ensures that the feature is loaded correctly in tandem with the other game modules.

• Inclusion of New Mixin - UTDigSpeedEntityPlayerMixin
  This mixin, implemented in UTDigSpeedEntityPlayerMixin.java, interacts with the EntityPlayer class. Its main functionality is to eliminate the penalty on block breaking speed during flight, thereby enabling normal block breaking speed for flying players.

• Updated Mixin Configuration
  A new mixin configuration file mixins.blocks.fastflyblockbreaking.json has been created to manage the application of the Fast Fly Block Breaking feature within the game. This centralizes the management of the new feature's integration.

• Compatibility and Toggling Functionalities Updated
  In UTObsoleteModsHandler.java, the newly included feature has been registered. This ensures that the feature is compatible with other game systems and can be easily toggled on or off.