* 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
* Added proper CPACK structure and added generation of openspace.h header to add verisoning information in CMake.
* Packaging(ZIP on Windows, TGZ on UNIX) and installer creation(Windows Only via NSIS) is now working.
* Fixes for packing an archive on OSX.
* Add missing files in packaging
Add install setting to the globebrowsing module to copy required gdal_data
Update Credits
* Updated application icon
