Revert "Fix inventory items blinking on item preloading"

The fix didn't work on some systems sadly this wasn't detected prior merge,
as preload is disabled by default now there's not gonna be a fix for it.
Let lighting be done only CPU side. Remove finalColorBlend implementation from shaders.
Make scrollbar scale according to DPI and scaling factor
Mod profiling support

Config settings:
profiling = true/false (gather statistics)
detailed_profiling = true/false (break mod times to callbacks)

Chat commands:
save_mod_profile saves current statistics in debug.txt and shows on console (on default loglevel)
Fix caption of config mods button (simple menu)