Increase the maximum quality of various graphics effects

[Alayan-stk-2]

While the biggest limitations on STK graphics are texture quality, 3D modelling quality, track lighting quality and engine performance handling complex tracks, there are some graphical options where improvements can be offered to players with the hardware to run it:

• LoD distances, to reduce popping. Done in 6cf094a and subsequent related patches
• Shadows. Done in ec4f406

Different shadow levels

2048 (new) - 1024 - 2048 (new) - 1024 - 512

• Other settings?
• Update the presets to make use of the new options when appropriate.

Also see #5076 ; which isn't about increasing the maximum quality offered by the game but is related.