ofxiOSSoundPlayer as default iOS player.

- removed ofxOpenALSoundPlayer and SoundEngine.
- added ofxiOSSoundPlayer and AVSoundPlayer
- updated iOS soundPlayerExample to demonstrate how both
ofxiOSSoundPlayer and AVSoundPlayer can be used within an OF app.
ofxiOSSoundPlayer as default iOS player.

- removed ofxOpenALSoundPlayer and SoundEngine.
- added ofxiOSSoundPlayer and AVSoundPlayer
- updated iOS soundPlayerExample to demonstrate how both
ofxiOSSoundPlayer and AVSoundPlayer can be used within an OF app.
updated example with different file formats.
removes duplicate ofQtUtils from xcode project. closes #311.
changed synth.m4a to synth.mp3
removed ofxiPhoneSetOrientation from ios examples
Merge pull request #2137 from roymacdonald/fix-iosExamplesOrientation

removed ofxiPhoneSetOrientation from ios examples
ofAppGLutWindow & ofAppGLFWWindow: convert native mouse button defines to OF
removed unused orientation defines.
Merge pull request #2138 from julapy/ios-remove-unused-orientation-defines

removed unused ios orientation defines
ofBaseApp: move event (un)register to ofAppRunner for compatibility with old projects
Merge branch 'develop' of github.com:openframeworks/openFrameworks into develop
merged.
Merge pull request #2127 from julapy/ofxiOSSoundPlayer

ofxiOSSoundPlayer as default iOS player.
Merge branch 'develop' of github.com:openframeworks/openFrameworks into fix/missing-directories
added bool return to createEnclosingDirectory