migrate OS X from NSAutoreleasePool to @autoreleasepool

Offending files found via:
$ find . -type f -name '*.h' -o -name '*.cpp' -o -name '*.mm' -o -name '*.m' -exec grep -l "NSAutoreleasePool" {} \;

While it would appear as though a lot of code has changed, really it is largely due to an extra level of indentation required by @autoreleasepool. Additionally, all lines touched should be normalized to use tabs instead of spaces - I'm not a fan of tabs, but I'd rather be consistent than not.

One API change made in ofSystemAlertDialog() to migrate off a mega deprecated NSAlert API.

One file was updated that targets iOS, seemingly missed in #2888.
made keyboard orientation fixes
removed comment, previously default orientation positioned rectangle bottom left
ofEasyCam: fixes floating point errors in rotation + events priority
Merge pull request #3118 from arturoc/bugfix-ofEasyCam

ofEasyCam: fixes floating point errors in rotation + events priority
CHANGELOG for last commit
ofEasyCam: fix roll inertia
Set the storedHandle to the doc so that it does not crash
Merge pull request #3119 from NickHardeman/bugfix-ofxXmlSettings-loadFromBuffer

ofxXmlSettings loadFromBuffer function crashes
Merge pull request #3117 from trentbrooks/bugfix-keyboard-orientation

made keyboard orientation fixes
solved issue with glDrawElements

when using glDrawElements the index buffer never gets bound. By adding
it to the bind method it gets added to the VAO state when VAO is used
or bound when not. To test use a VBO and and a mesh with setMesh and
draw with drawElements
ofEasyCam: fix inertia, when there's no mouse movement
Merge branch 'master' of github.com:openframeworks/openFrameworks
Merge pull request #3123 from patrickFuerst/master

solved issue with glDrawElements
Removed unused variables.
Merge pull request #3126 from bakercp/ofVbo-unused-var-cleanup

Removed unused variables from ofVbo
ofGst*: fix memory leaks
Merge branch 'master' of github.com:openframeworks/openFrameworks into bugfix-gstmemleaks
breaklines
ofGstVideoPlayer: fixes mem leaks in windows