add ofSoundBuffer

Currently integrated with ofSoundStream, though audioIn and audioOut
haven't been reworked to use ofSoundBuffer instead of a float *
add ofSoundObject and ofSoundUtils to OSX xcode project
add ofSoundObject and ofSoundUtils to iOS xcode project

(also implement bare-minimum getDeviceID in ofxiOSSoundStream)
add ofSoundObject (and include in OSX/iOS xcode projects)
add soundObjectExample
add ofSoundBuffer-based callbacks to base sound i/o
integrate ofSoundBuffer into RTAudio sound stream
add simpler reference-based setters for sound object i/o
add copyFrom for float * in ofSoundBuffer
integrate ofSoundBuffer into iOS sound stream
replace deprecated ofPtr with shared_ptr
use a 512 sample buffer in soundObjectExample

Windows does not appear to be a fan of single 64 sample buffers
add new sound files to visual studio OF project
Small example cleanup.
References / Pointers updates.
const correctness for ofSoundBuffer functions
add simple sample accessor to ofSoundBuffer
more accurate rms calculation in ofSoundBuffer
add copy ctor, operator=, dtor to ofSoundBuffer
add soundBufferExample