Removes previously deprecated functions and methods

[Adammatthiesen]

This pull request removes a large number of deprecated compatibility classes and interfaces from the matthiesen_lib package. These classes were previously maintained to provide a transitional layer to the newer matthiesen_lib_api package, but are now being fully removed as part of codebase cleanup. This eliminates redundant code and encourages all consumers to use the new API directly.

Key removals by theme:

Command and Registry Compatibility Removals:

• Removed deprecated AbstractCommand, AbstractCommandRegistry, and related command registration interfaces and managers, which previously delegated to their matthiesen_lib_api counterparts. [1] [2] [3] [4]

Permission System Compatibility Removals:

• Removed deprecated permission-related classes and interfaces, including Permission, PermissionLevel, AbstractPermission, and permission managers and validators. These previously wrapped or extended the new API. [1] [2] [3] [4] [5] [6]

Text Parser and Platform Compatibility Removals:

• Removed all deprecated text parser classes and interfaces, including built-in parser enums, parser managers, and vanilla parser implementations, as well as platform-related interfaces. [1] [2] [3] [4] [5] [6]

Utility Class Compatibility Removals:

• Removed deprecated utility classes such as ItemBuilder, ItemDecoder, and SoundsPlayer, which previously forwarded calls to the new API. [1] [2] [3]

Configuration Compatibility Removals:

• Removed the deprecated ConfigManager class, which previously forwarded configuration management to the API package.

These removals complete the migration to the matthiesen_lib_api package and reduce maintenance overhead by eliminating transitional code.