Make sure to disable scissor when doing the initial clear of a new FBO.

Minor cleanups.
Improvements to CMake install.
Search for assets in executable path on Linux. Fixes #4738
Also remove redundant checks based on build directory.
Fix a stupid mistake in the headless timeout.

Although, still need to figure out why it gets corrupted.
Oops, fix a bad sort for the hashmap.

Fixes assertion warnings.  Thanks @Kingcom.
Qt: Update German translations. Fix #4653
Proper fix for german translation.
Use libpng on Blackberry.
Try to more correctly handle stencil when blending.

Although, not accurate, this will attempt to KEEP and etc.
Merge pull request #4740 from unknownbrackets/stencilalpha

Try to more correctly handle stencil when blending.
Replace alpha when blend mode allows it.

Some games are using fixed/fixed blending modes which work in our favor.
Merge pull request #4741 from unknownbrackets/stencilalpha

Replace alpha when blend mode allows it.
Update native
Set src/dst alpha to non GL_ZERO in case STENCIL_VALUE_UNIFORM
Merge pull request #4744 from raven02/patch-28

Set src/dst alpha to non GL_ZERO in case STENCIL_VALUE_UNIFORM
Update native: disable EGLConfigChooser on android.

It seems to choose suboptimal mode on several phones.

May cause us to get no stencil buffer in non-buffered, but meh.
Use libpng to load PNGs. Fixes #4689.
Remove stb_image usage (no longer used for anything).
Windows/Android buildfix.
Merge branch 'master' of https://github.com/hrydgard/ppsspp into resetting