Feature/gb gui (#390)

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

modules/imgui/include/gui.h

@@ -27,6 +27,7 @@
 
 #include <modules/imgui/include/guicomponent.h>
 #include <modules/imgui/include/guifilepathcomponent.h>
+#include <modules/imgui/include/guiglobebrowsingcomponent.h>
 #include <modules/imgui/include/guihelpcomponent.h>
 #include <modules/imgui/include/guiperformancecomponent.h>
 #include <modules/imgui/include/guipropertycomponent.h>
@@ -66,6 +67,7 @@ public:
 //protected:
     GuiHelpComponent _help;
     GuiFilePathComponent _filePath;
+    GuiGlobeBrowsingComponent _globeBrowsing;
     GuiOriginComponent _origin;
     GuiPerformanceComponent _performance;
     GuiPropertyComponent _globalProperty;
@@ -78,6 +80,8 @@ public:
 #endif // OPENSPACE_MODULE_ISWA_ENABLED
     GuiParallelComponent _parallel;
 
+    bool _showInternals;
+
 private:
     void renderAndUpdatePropertyVisibility();