Support \ paths within filenames.
Fix Windows logging

Fix https://github.com/hrydgard/ppsspp/issues/4239
Add a touch control visibility screen. All touch controls can now be toggled on or off, except for the Pause button on platforms that have it, as a safety precaution.
Adjust a couple styling issues.
Make Toggle All actually function.
Make non-image Choices translatable from the MappableControls section.
Add TouchControlVisibility.cpp/h to Visual Studio project "UI".
Use unknownbrackets  method
Remove rebase junk, update CMakeLists.txt, update Android.mk.
Make the header and Control Visibility texts translatable.
Default to true for all touch control visibility, and actually translate Control Visibility.
Fix Android build, adjust includes.
Make the text and images centered.
Buildfix Symbian and Blackberry from the ffmpeg merge.
Fix a header issue on Blackberry.
Fix a UINT64_C define issue.
FFMPEG is no longer 'beta'.
Use the newer interface for Qt's gpu debugging.
Merge pull request #4254 from unknownbrackets/qt-minor

Use the newer interface for Qt's gpu debugging
Merge pull request #4249 from unknownbrackets/io-minor

Support \ paths within filenames (Linux/Android?/etc.)
Merge pull request #4251 from sum2012/log

Fix Windows logging
Merge pull request #4252 from thedax/touchControlVisibility

Add a screen to toggle onscreen touch control visibility.
Merge remote-tracking branch 'upstream/master'