Remove all chord keyboard shortcuts
These things:
Reasons:
- Their scope of focus is unclear
- Many of them don't work (https://bugs.kde.org/show_bug.cgi?id=433292)
- Users don't understand what they mean or how to use them (https://bugs.kde.org/show_bug.cgi?id=433841)
I'd like to propose removing all of them from Plasma. Any actions that still benefit from having shortcuts should have clearly global-scoped shortcuts using Meta key.