Add SoX custom effect (-effect) switch to sound entry extraction
Changes for 1.08

- rewritten help page
- removed spr32 command stage
- rawblock crop now saves frame offsets (which allows to generate
correct sprite file from it)
- new option "packsprite" for omnicide installer, which will generate a
new packed sprites that uses atlas textures.
- omnicide-related code are moved to separate omnilib/ folder.
- cleaned up memory allocation utils
- omnilib are used to load and save .spr32 files (so dpspr32file.cpp
will be removed in future)
- fresh SoX build