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/base/dashboard/dashboarditemangle.cpp

@@ -353,7 +353,7 @@ void DashboardItemAngle::render(glm::vec2& penPosition) {
     const glm::dvec3 a = referenceInfo.first - sourceInfo.first;
     const glm::dvec3 b = destinationInfo.first - sourceInfo.first;
 
-    std::fill(_buffer.begin(), _buffer.end(), 0);
+    std::fill(_buffer.begin(), _buffer.end(), char(0));
     if (glm::length(a) == 0.0 || glm::length(b) == 0) {
         char* end = fmt::format_to(
             _buffer.data(),