Completely removes the build dir in favor of cmake based build layouting

This is more of a temporary fix for the time being, it needs to handle
blend state changes better, perhaps via push/pop of state changes

Closes #181

No need to give it a name other than the empty string

Rename it from mac-screen-capture.m to mac-display-capture.m to be a bit
more consistent

With no device present the capability callbacks would cause an
infinite loop.

It was kind of silly that it was residing within the test-input module.

Some x264 parameters actually use the ':' character for their
parameters, so I feel like space would probably be a bit more ideal.

Also add a fallback conversion via AVFoundation in case the native
format isn't supported

Add callbacks for total bytes sent and number of dropped frames

Instead of making the send buffer size super small, just do a sleep when
sending data to simulate the inability to send out as much data as
desired.

Autoselection is only implemented for frame rate as it doesn't make
sense to autoselect the video format (Any fills the role of library
supplied autoselection) or the resolution (it may make sense to
implement resolution matching based on the current transformation
settings in the future though)