Refactor debug message output to use context registry specific implementations
Merge remote-tracking branch 'origin/master' into debug_output_refactoring

Conflicts:
	source/glow/CMakeLists.txt
	source/glow/source/debugmessageoutput.cpp
Merge pull request #214 from hpicgs/debug_output_refactoring

Refactor debug message output to use context registry specific implement...