Darkened the Blue Gray for better visibility on areas with fog of war.

Added and modified the following textures to have drop shadows:
aimdir_orbit_arrow.dds
aimdir_orbit_path.dds
aimdir_path.dds
aimdir_strafe_arrow.dds
aimdir_strafe_path.dds
aimdir_arrow.dds

Added 5 more unique colors (a total of 16, including white)
Enhanced drop shadow.