Help splitting kde-workspace

[Àlex Fiestas]

Hi there

It was requested by the maintainers of some of the projects that live in the 
kde-workspace repo that they would love to keep the whole history after the 
split. Doing such thing is easy for projects that have not been moved (kwin, 
powerdevil) but otherwise it requires git-fu that we clearly lack.

The following folders (to be split) are the ones that need to be split keeping 
all the history and where a simple git filter-branch won't cut it:
plasma-workspace
plasma-desktop
oxygen
libksysguard

So we need help to split those while keeping the whole history. Could you lend 
us a hand?

Alternatively we could use grafts like we have done with frameworks.

Cheers.