v17.8-dev15

• A fix to rendering "portals" (e.g. Dark Forest in G1, enabled via CTRL+F11) (095ebcb)
• Video-Data is preinitialized with black pixels to avoid some problems with bink library (2400a1f)
• Clamping of FPS values, so that it's easier to target common values (30, 60, 75, 90, 100, 120, 144) (bbd0847)
• Remove limitation for drawing only triangle fans in DrawPrimitive method (8c73b7d)
• Fix rendering special materials(like portals) in shadow maps (ee7f23e)