Version 0.04 updates

MAJOR CHANGES:

•  More hallways and a prototype room with placeholder items.
•  Players can now open doors and trigger small sequences.
•  falling out of the map will kill you and trigger a death screen.
• untested support for Linux exists.
• Options Menu has begun development, and you can now adjust your cursor sensitivity.

SMALLER CHANGES:

• Sprint bar and limited stamina are now in the game.
• UI has been cleaned up.
• Game has been further optimized.