rough linux install support
Added autoresolving of compatibility problems
Eliminated divide operations in `BasicImage.vs`
Updated `BasicImage.fs` to write `gl_FragColor` in the last statement
This is known as work-around for some GLSL related driver bugs.
Reduce “cannot build” error
HDR rendering (experimental)
Tune effects
Restore highlights by tonal correction (HDR only)
Reduce glitches in HDR caused by denormals
Brightness of lens flare fixed (HDR)
Reduce HDR glitch
HDR uses `r_hdr` instead of `r_highPrec`
Linear rendering pipeline (HDR only)
Merge branch 'linux_install' of https://github.com/noway421/openspades into noway

Conflicts:
	Sources/Gui/Main.cpp
tune lens filter
Reduce HDR glitch and post-filter tuning
work-around for water artifact when used with volumetric fog