PixelPusher-objc

This is pretty much a direct port of Heroic Robotics' PixelPusher-java library.

This library was built and tested for iOS. In theory this library should work with OS X as well, though I've never tested it there.

Framework dependencies:

• CFNetwork.framework
• QuartzCore.framework
• Security.framework

3rd Party Submodules:

• CocoaAsyncSocket
• HLDeferred
• Lumberjack

Departures from the Java implementation:

• using GCD and mostly on the main queue (thread) instead of using threads directly. packet dispatch uses non-main queue. i'm waiting to see when/where performance suffers to introduce non-main/concurrent queues.
• Pixel struct is float R,G,B instead of byte
• no 5-axis RGBOW pixel support (don't know what devices do this)
• PPPixelPusher defers allocation of strips so parsing status packets in PPDeviceRegistry uses less memory
• DeviceRegistry uses 3 different notifications (add, remove, update) instead of just 1 (something changed, you figure out what)

TODO:

• instrumentation (bandwidth)
• use C-arrays instead of NSArray (measure perf diff)
• use non-main queues
• use actual pixmap for strip backing buffers
• allow strips to use external back buffer (map all strips into one single pixmap, use OS drawing routines)