Make VS2012 the default build environment.
Produce better debug symbols in release builds.

Reference:
https://randomascii.wordpress.com/2013/09/11/debugging-optimized-codenew-in-visual-studio-2012/
Propose a RGB mediatype with negative height on connect.

This can help the renderer/post-processor to pick the "proper" type,
so that flipping RGB images can be avoided.