Move ride_create_command into GameActionCompat
Refactor GameActions to return the GA_FLAGS instead of using the const value.
Refactor passing params to GameActions over constructor.
Added callbacks for GameActions and network support for them.
Refactored GameAction registration due static library issues.
Moved all C functions into a single file.
Simplified data serialisation of game actions.
Moved the flags away from parameters.
GameAction base now serialises mandatory data such as flags and player.
Split some functions from network in order to move command processing to the end of tick.
