Feature/CMake (#1443)

General CMake cleanup/overhaul
* Enable precompiled headers for all projects
* Move specifications itto separate CMakeLists files
  * Add openspace-core as a subdirectory
  * Move handle_modules functionality into modules/CMakeLists.txt
  * Move handleapplications logic into apps/CMakeLists.txt
* Introduce openspace-module-collection interface library to simplify inclusion of modules in applications
* Turn module initialization into a two-step process to adapt to the new minimal dependency scenario
* Compile time speedup
  * Remove circular dependencies between modules and core preventing multithreaded compilation on MSVC
  * Build Spice multithreaded and as static library
  * Remove dependency from core to module-webbrowser
  * Remove unused dependency from kameleon
  * Remove additional unnecessary dependencies
  * Cleanup volume/kameleon/kameleonvolume modules
  * Fix visibility issues. Restrict include paths
  * Compile kameleon in parallel
* Other cleanup
  * Only copy CEF files from one target (hard-coded to OpenSpace right now)
  * Remove unused instrumentation code
  * Remove the ability to render AABB for globes as it caused a circular dependency between GlobeBrowsing and Debugging
  * Removing compiler and cppcheck warnings
  * Turn almost all includes into non-system includes
  * Don't warn on deprecrated copy
* Updated submodules

modules/debugging/rendering/debugrenderer.h

@@ -27,10 +27,6 @@
 
 #include <openspace/util/updatestructures.h>
 
-#ifdef OPENSPACE_MODULE_GLOBEBROWSING_ENABLED
-#include <modules/globebrowsing/src/basictypes.h>
-#endif // OPENSPACE_MODULE_GLOBEBROWSING_ENABLED
-
 #include <ghoul/glm.h>
 #include <ghoul/opengl/ghoul_gl.h>
 #include <memory>
@@ -132,15 +128,6 @@ public:
     void renderCameraFrustum(const RenderData& data, const Camera& otherCamera,
         const glm::vec4& rgba = { 1.f, 1.f, 1.f, 0.3f }) const;
 
-#ifdef OPENSPACE_MODULE_GLOBEBROWSING_ENABLED
-    /**
-      * Takes a AABB3 in screen space and returns vertices representing the corner points
-      * of the AABB. The ordering of the corner points is compatible with the box
-      * rendering methods in this class.
-      */
-    const Vertices verticesFor(const globebrowsing::AABB3& screenSpaceAABB) const;
-#endif // OPENSPACE_MODULE_GLOBEBROWSING_ENABLED
-
 protected:
     std::unique_ptr<ghoul::opengl::ProgramObject> _programObject;