Added support ccache for speedup recompilation

[GermanAizek]

@wopox1337, @s1lentq more information:
https://ccache.dev/
https://en.wikipedia.org/wiki/Ccache

[Garey27]

Hello, Ccache its indeed good solution for large projects if you delete "build" directory of CMake, but RegameDLL is not that large, and if you using it for developing its not will speedup too-much because CMake already build only changed files. Or maybe you can show some real case that Ccache is usefull?