Implemented new GUI component to handle WMS servers
* Add Lua scripts to support adding GIBS datasets (closes#222)
* Add Lua function to load WMS servers from a predefined file
* Workaround for Visual Studio 15.3 compile fix in Windows headers
* Initial support for parsing GetCapabilities file and automatically add layers
* Add a Trigger property to remove a layer
* Support default servers
* Add default file
* Move WMS server code from GUI component into GlobeBrowsingModule
* Add Lua scripts for loading and removing WMS servers
Automatically load default servers on startup
* Reset tile provider before removing a layer tolimit the crash risk
Add "From focus" button to switch globebrowsing gui to the same node as the focus
* Remove warnings
Remove compile error with nonexisting GDALOpenEx function
* 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
