Removed leftover FFP code: We should now be GL2 GLSL1.30+ forward compatible. Added a seperate shader for the gradient used for water drawing. Disabled 3D mode for GL2 codepath as this still has some FFP left.

[patterns]
**.h = native
**.c = native
**.cpp = native
**.lua = native
**.txt = native
**.pas = native
**.inc = native
**.hs = native