Fake additional lights

[Delt06]

Closes #180

Rendering 256 atlas of fake lights always takes 15000 cycles, for 512 - 32000, for 1024 - 93000.

	No Lights	Per-Pixel (Max 4)	Per-Vertex (Max 4)	Fake (Bilinear, 256)	Fake (Bicubic, 256)	Fake (Bilinear, 512)	Fake (Bilinear, 1024)
Absolute (MC)	4.2	9.7	4.4	4.615	6.74	4.92	5.53
Diff (MC)	0	5.5	0.2	0.415	2.54	0.72	1.33
Relative (%)	0	100	3.6	7.5	46.2	13.1	24.2

Result: removing bicubic, resolution increase is not that slow.

MC = millions of cycles