pd_courtyard_event_b4

- Added occluders to improve performance
- Added more skybox brushes to improve performance
- Removed unnecessary hint brushes
- Removed unnecessary reflective water brushes
- Added an embedded nav mesh

Adjusted compiler settings for more accurate lighting.

Beta 3 of pd_courtyard_event has been posted. The most notable changes are as follows:

- Fixed the skull pickup prop not animating properly
- Fixed the timer always being displayed as 0:00