retro-environment-interfaces: Normalize coding style
Rename VideoHandler in VideoInterface
Rename AudioHandler in AudioInterface
Rename InputHandler in InputInterface
Rename VariablesHandler in VariablesInterface
Core: Normalize coding style
Normalize copyright headers
Retro: Add API_VERSION and commentaries
Move Core delegates to Module
Move RumbleEffect into Rumble
Move SensorAccelerometer and SensorAction to Sensor
Move performance related types to Performance
Move LogLevel to Log
Move CameraBuffer to Camera
Move Rotation and PixelFormat to VideoInterface