This Runner now loads a list of Kate's sessions and matches KRunner's queries against it.
It's pretty much ready to move into kate.

The matching goes as follows:
* You type "kate" into the krunner interface, this Kate Session Runner adds all kate sessions, with a low priority (0.5)
* You type "kate gnirrep" and the runner will find a session called "gnirrep", priority 1.0
* Typing just a part, such as "kate gnirr" also results in a match, but lower priority (0.8)
* Typing just the (parts of) the name of the session will also match (the "kate" in the query is optional).

All matching is case-insensitive.
Happy hacking!