Bug#1022747: RFS: prismlauncher/5.0+ds-1 [ITP] -- FOSS Minecraft launcher supporting multiple instances and accounts

[Bastian Germann]

As already mentioned in #1023160 you can get rid of the ghc filesystem library.
You have to patch CMakeLists.txt and launcher/CMakeLists.txt and can then 
remove libraries/filesystem.

Also, please remove libraries/tomlplusplus.