provide kksrc file (for KDE plasma settings)

[DavidBruchmann]

Feature Description

the existing *.hotkeys file doesn't satisfy the needs in current KDE plasma settings, as a *.kksrc file is needed.
While on the one hand the options are quite limited which key(-combination)s can be entered, there might be still more key-words (Configure, Capture, Launcher, _launch, ...) that could be added perhaps, fiddling out what these keywords could be. I haven't done though.
A simple adjusted file could look like this:

[org.flameshot.Flameshot.desktop][Global Shortcuts]
Capture=Print
Configure=Alt+F
Launcher=Alt+L
_launch=Shift+Print

Not all options are covered, as the key-words are as mentioned not known, the options should at least cover this list from the documentation:

[DavidBruchmann]

According adjustment of the documentation would be helpful.