* Some cleanup of the ImGUI code
* Reorder the panels
* Make StringPropertys work without losing value on context loss
* Add a new ImGui compoment that shows the status of the scene graph

Issue/1989

* GLFW cannot detect the buttons for the enterprise version of the
  SpaceMouse

Prevents errors from the UI

Issue/1964

Feature/jwst pointing

Move the launcher image synchronization from base -> base_blank  and move the trail actions from base_blank -> base

* added first moon, mars and mercury layers from treks

* fixing newline at eof

* updated assets for comments

OpenSpace/OpenSpace-WebGuiFrontend/#80

* Add enabled property to exoplanets and sky browser module

* Create assets for default settings and restructure assets into a components folder

* Update exoplanets data

* Set sky browser enabled to true per default and include hover circle asset

* Add name and description of hover circle, and used synced version of ring image

Make only the first window UI-able,  warn about window sizes that can produce problems,  no longer allow resizing of UI windows

interaction sphere and brightness/opacity fixes. (Closes #1994)

 - Correct the behavior of the V-Sync
 - Handle more than 2 monitors