GLEW and FreeGLUT refactor and cleanup

[a740g]

This PR is a refactoring effort to cleanup and consolidate GLEW and FreeGLUT dependencies. The goal is to improve code organization and simplify the handling of GLEW and FreeGLUT dependencies.

Major Changes

• Updated FreeGLUT to version 2.8.1 (latest 2.x version).
• Updated GLEW to version 2.2.0.
• Decoupled GLEW from libqb.
• Removed dead code and unnecessary directories.
• Clearly marked all custom changes to FreeGLUT with comments (starting with QB64-PE: ...).

Notes

While the pull request indicates 1135 files changed, a majority of these modifications involve the removal of dead and redundant files. This significantly streamlines the content in internal/c/parts/core. The compilation structure for FreeGLUT and GLEW remains consistent, utilizing flat-directory compilation. Several non-critical custom changes to FreeGLUT were reversed, achieving the same functionality through makefile logic where possible.

What's Next?

This refactoring sets the stage for a smoother transition to FreeGLUT version 3.x or alternative libraries such as GLFW version 3.x.

• FreeGLUT 3.x:

  • Most custom changes made to the 2.x version can be replicated using newer callbacks in FreeGLUT 3.x.
  • Note: FreeGLUT 3.x lacks a callback for file drag-and-drop, necessitating investigation if transitioning to 3.x without altering library code.

• GLFW:

  • Transitioning to GLFW demands more effort, as it does not control the event loop. However, this offers precise timing and lower latency.