overhaul update

New update (yippie)

Added:

- tutorial hints
- new secret weapon (sg15 x2)
- new enemies
- ability to pause the game

Changed

- rebalanced difficulties
- rebalanced weapons
- level reworks
- second cutscene overhaul

Fixed

- reselution issue resolved
- performance improvements
- cutscenes are always skipable now
- lighting issues
- inconsistent fonts in main menu