Revert hog tinting from
rdb65298717da since it wasn't sufficiently complete for a release. More sprites need converting, and there's a slight bug in hog tinting, for away hogs with hats I believe.
also fix top/bottom and side-by-side rendering (got also broken in webgl branch)
fix stereoscopic rendering leading to screen "running away to the left" since webgl merge (due to bug in webgl branch). reason was incomplete change of name/scope of variable stereoDepth -> cStereoDepth
flib:
- Ability to pass raw data via IPC
qmlfrontend:
- Pass message received by callback through event loop to handle it in main thread
- Get preview image from engine on button click and render it in Image object