Merge pull request #116 from flokuep/develop

Some fixes and improvements.
Fix crash on category change
Fix crashes/assertion failures on theme/skin change
First step of fixing theme saving (still needs some work)
Remove unnecessary lock
Remove PitchTracker# (not good enough)
Fix some resharper warnings and errors
Revert "Remove unnecessary lock"

This reverts commit c96fac02c2d9822c08c75ca2586ee833295f02aa.
Merge pull request #117 from flokuep/develop

Added cover-theme, updated language-files
Merge pull request #119 from flokuep/develop

Some fixes on names-screen.
Merge pull request #120 from flokuep/develop

Fixed starting server and creating profiles.
Fix unexpected deselect of start
Fix incomplete song menu
Fix portAudio error msg
Fix double ending a song session
Merge pull request #118 from Flamefire/develop

Develop
Merge pull request #121 from flokuep/develop

Smaller improvements
Fixed slideshow.
Fixed credits-screen (and added lukeIam finally!)