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.
removes nonexistent files from openFrameworksLib xcode project
updated example with different file formats.
Merge pull request #2129 from thiagohersan/fixXcodeProj

removes nonexistent files from openFrameworksLib xcode project
creates missing directories when saving any files. closes #460.
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.
Revert "removed unused orientation defines."

This reverts commit 26bf861c9770d3c861d24bf5b390db9010b260bc.
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