replaced TARGET_OF_IPHONE with TARGET_OF_IOS

ofOpenALSoundPlayer was using old TARGET_OF_IPHONE guard,
have updated to use TARGET_OF_IOS guard.
updated TARGET_OF_IPHONE guard to TARGET_OF_IOS

ofOpenALSoundPlayer was still using TARGET_OF_IOS guard which is
deprecated,
have updated to TARGET_OF_IOS.
Merge pull request #3072 from julapy/ios_targets

updated TARGET_OF_IPHONE guard to TARGET_OF_IOS
Merge branch 'master' of https://github.com/openframeworks/openFrameworks.git into rexgo
remove glGetString that can return NULL

closes #2824
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
allow OSC message send without bundle wrapper, fixes #1804

Tested against example OSC projects, which now send without bundles where appropriate. The message variant of ofxOscSender::sendParameter() also now sends without a bundle wrapper.
removed unused clear()

closes #2600
ofxiOSKeybaord fix.

- getText now returns the UITextField text value.
- getLabelText is now deprecated as it was not properly implemented.
removed unused _ctext variable.
Merge pull request #3077 from julapy/ios_keyboard_getText_fix

ofxiOSKeyboard fix.
Merge pull request #2438 from pizthewiz/feature-optional-osc-bundles

Feature allow OSC message sends without bundle wrapper
ofTTF: use texture swizzles. Closes #3080
Merge branch 'master' of github.com:openframeworks/openFrameworks
Merge branch 'master' of https://github.com/openframeworks/openFrameworks.git into rexgo