Frederic Türpe

Implement base path retrieval API for resource providers

Add resource manager API to retrieve all base paths used by the individual resource providers

Implement handling of short format and alpha for hex-code colors, deboostify the whole parseColor function

Fix random crashes from harfbuzz

Implement background drawing when no background color is specified in the markup but through setBackground

Set default background color to transparent black, move some utility functions into separate file

Fix various issues - basic text drawing now works crashfree

Add background drawing (not working yet), some other small changes, fix SimGearConfig.cmake to look for Pango instead of PangoMM