Clean repository & improve build system

[thomaslepoix]

• Remove build/ dir, .plist files.
• Discuss what to do with IDE configuration files such as .ccls, .vimspector.json or .vscode/, personally I am not in favor of including those in the repository.
• Create a clang-format or uncrustify configuration file.
• Deport the CMake coverage code to cmake-utils.
• Wrap in a Makefile the Docker command described in the README. (There once was one if I remember correctly, did we decide to remove it? @Dauliac what is your point with that?). [Solved by Nixify #32]
• Try to integrate some tools such as : (this is rather related to cmake-utils)
  • Memory sanitizer.
  • Templight.
  • A fuzzer (LLVM libfuzzer or AFL++).
  • Clang static analyzer through CodeChecker.