* Rename OnScreenGui module to ImGui
* Support multiple external module folders (closes#31)
* Cleaning up CMake files
* Restructure application specification
* Add parameter for library mode to all modules
* Add functions to handle global variable state
* Misc/remove warnings (#383)
* Increase build timeout and do a clean rebuild every commit
* 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
