Fix some bugs in touch input related to the src_rect/dst_rect stuff. As a consequence, I had to internally deprecate the local_rect/window_pos settings. There is backwards compatibility, but it doesn't support window_scale or scale_to_fit, so if you need that, just move to src_rect/dst_rect.
Framework-level keyDown quit was bypassing the shutdown process and directly exiting the app.
Add ipch to gitignore
Clean up touch so there is now a single touch_mode that controls whether it's using tuio, system, mouse.
Add a stats view to the engine, which you can open by pressing 's.' Currently just shows the number of sprites and the touch mode (which you can toggle with 't').
Merge branch 'master' of https://github.com/Downstream/ds_cinder

Conflicts:
	doc/example_settings/engine.xml
	src/ds/app/engine/engine.cpp
	src/ds/app/engine/engine.h
	src/ds/ui/touch/touch_manager.cpp
	src/ds/ui/touch/touch_manager.h