The achievements during the first GSoC period in KStars

I was able to do major improvements to the build system of KStars. I think more and more open-source projects should pick up these low-hanging fruits with CMake and Clang:

- CCache: Speed-up the development time and working with git branches by caching the compiled object files.
- Unity Build: This simple "hack" can reduce the build time dramatically by compiling temporary C++ meta files in which the normal C++ files are included. The build time can be speeded up to 2x-3x for bigger projects.
- Clang Sanitizers: Use undefined behavior and address sanitizers to hunt down memory handling errors. Although the executable must be recompiled with Clang and special compiler flags, the resulted binary will run with minimal slowdown. It is not a complete replacement, but these sanitizers can catch most of the problems found by Valgrind during normal runtime.
- Clang Format: Format the source code with a real compiler engine.

More details are on our wiki page:
https://techbase.kde.org/Projects/Edu/KStars/C%2B%2B_developer_tools_with_KStars_on_Linux

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