Introduce subsystems for memory and loop

[Sonnexo]

This pull request does:

• Change the whitespace (?) of "DiscoPoP/DiscoPoP.cpp" a lot -- sorry for that, maybe you know how to avoid that?
• move the injected functions to the directory "injected_functions/" so "functions/" is free to use
• introduce separate files for some 'hidden' injected fucntions
• move all memory-related stuff to the directory "memory/"
• rename some files in "memory/" so that their filenames describe their content
• move all function-related stuff to the directory "function/"
• move all loop-related stuff to the directory "loop/"
• introduce "share/include/debug_print.hpp" which uses RAII to print the entering and exiting of a function
• Introduce the class "Timer" in "share/include/timers.hpp" which uses RAII to time a function
• Add a benchmark for the MemoryRegionTree
• Add a lot of unittests for "memory/" and "loop"

[Sonnexo]

check-license.sh, LICENSE and DiscoPoP.cpp should now be unchanged -- there was an issue with the line ending