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
* Cleanup
* CMake cleanups
* Update current year
* Update copyright header
* Use script to return list of all modules
* Update credits, license and ghoul
* Correctly specify maximum text sizes for grids
* Use StaticScale transformations in grids and remove fixed radius
* Fix Verifier to let grids accept non-integer min and max sizes
* Add a new scale that changes it's value based on the current time and a reference time
* Add a proper radiosphere that grows in real time (closes#728)
* Add default globe customization folders to the assets (closes#724)
* Add new dashboarditem that shows the current camera velocity (closes#702)
* Add ability to add interesting times to a scene (closes#715)
* Reenable keybindings gui element
* Add ShortcutManager
* Add ability to bind keyless keybinds to use as arbitrary shortcuts (closes#710)
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
