[Feature request] support additional qualifiers for "applications: "

[kermitfrog]

Is your feature request related to a problem? Please describe.
Autosnapping windows by window class is a bit limited, as it will snap all windows of an application (and might not work for some that report an empty string).
But usually I want dialogs of an application to be floating.

Describe the solution you'd like
The applications field should either take an array of strings (when class is enough / backwards compatibility) or objects. The object would specify additional qualifiers (see KWin's Window Rules).
At least the window title should support RegEx.

(In my experience with inputmangler, the class + regex on title is enough to identify anything I want and I know both properties to be available in KWinScripts)