Various fixes and bitfield type support

[psiberx]

• Fixed NewProxy crashes and corrupted lua state in some cases
• Fixed TweakDBID ctor crash when a non-null-terminated string is passed
• Fixed UnknownType memory leak
• Fixed Variant memory leak
• Fixed lua error logging for Overrides
• Fixed random crashes when modifying TweakDB
• Added basic bitfield type support (properties treated as integers)
• Added workaround to handle circular requires (returns nil early for circular dependency)
• Simplified memory management when converting lua values to RED types
• Removed some dead code

[maximegmd]

Thanks a lot for the fixes!

[psiberx]

I think that's all for now :)