* Initial restructuring of the Globebrowsing branch
* Update Ghoul repository
Fix include guards
* More cleanup
* Split texttileprovider subclasses into separate files
* Move TileProviders into namespace
* Convert static class methods into free functions
* Splitting tile subclasses into their own files
Remove `using namespace` from header file
* Split TileDataSet subclass into separate file
Update SGCT reference
* Move shader preprocessing data into internal class
* More Globebrowsing cleanup
* More cleanup
Remove unused Convexhull class
