#include fixes for windows

Pretty function unfortunately doesn't exist in windows. Funcsig I
believe is the closest you can get. I'm not sure about the cinder
includes with respect to other platforms, but I needed them to compile
under windows.
Remove PRETTY_FUNCTION usage.
Update rotation to use radians.

Cinder recently changed to use radians throughout.
No conversion needed!
Scoped color. Implement Debug DrawString.
Pull in additional headers only on windows.