Fixing bugs, OpenGL 2.0 support

[Prevter]

• Fixed hitboxes showing up in practice mode when they shouldn't
• Fixed hitboxes not working with mirror portals
• Fixed player getting stuck in the air on level complete in replays
• Added a toggle to fix player rotation in replays
• Fixed issues with macOS (Wine) and older hardware (OpenGL 2.1)
• Added a toggle into mod settings to enable legacy OpenGL support

Other:

• Added symbols export to help with debugging

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This discussion was created from the release Fixing bugs, OpenGL 2.0 support.