Some small changes and fixes

Changed:

- Removed Depth of Field from Post-Processing as it made the game look terrible

- Screen renders now use Clamp Filtering instead of Bilinear.

- Changed the Speedrun Timer's Font.

- Seperated the Settings into it's own menu to help declutter the UI.

- Timer now stops upon losing the game.

Fixed:

- Fixed showing the default Unity Skybox in the Main Menu if you were to resize the window.