- significant changes to the in-game pause menu system.
- added basic audio settings to persistent data system.
- updated graphics screen options with descriptions.
- fixed a bug where mouse was not locking/unlocking properly when pausing/unpausing the game.
- removed controls: [Q] no longer quits the game. [ESC] will only pause the game. quitting and returning to the game are now handled by button clicks.
- optimisation for some of the systems that handle updating various game data parameters.