Merge branch 'feature-threaded_rendering' into develop
Removed NSLog's which would pollute the console.
Updated version for 6.7.0-dp-7.
Fix build error due to use of parentwindow rather than getparentwindow().
Merge branch 'feature-threaded_rendering' into develop
Merge branch 'develop' into feature-threaded_rendering
[[ ThreadedRendering ]] Put a global lock in MCThemeDraw (uses MCimagerepmutex for now) as the Linux themeing code is not thread-safe (due to initialize on first use statics).