Updated to 'gold master'

Basically uploaded the final build according to the requirements of the class assessment.

Graphics options, audio options and keybinding options are still unfortunately placeholders, but now the difficulty settings do actually do something!

Bugfixes from Alpha:

- Walls clipping into each other has been minimized

- Clyde (red skeleton) will not longer be shown as fleeing but still able to hurt the player

- Issues with the pause menu interface overlapping itself has been resolved

- Skeleton tracking and aggress has been tweaked as well as tying it to the difficulty settings. I guarantee you can't beat Gamer difficutly.

- Hitboxes for the door buttons as well as the method for detecting the buttons has been tweaked and is now completely consistent.

- A visual cue for nearby buttons has been added so if they are out of line of sight the player can see them still