* Initial syntax is the following:
* $template{{ some JS code here }} - simple template based on JS
code inside. It works the same as lambda functions, but calculates
only once.
* aw_count(regex) - keys count found for given regex
* aw_keys(regex, [separator]) - keys found for given regex and
joined by using given separator
* aw_names(regex, [separator]) - key names found for given regex and
joined by using given separator (the same as previous but w\o $)
The template and function syntax may be changed before release.
* replace `foreach` to `for (auto foo : bar)` and update CONTRIBUTING.md
accordingly
This fact caused by the qt signal-slot implementation. Even if slots
code is going into parallel they will be called in the main app thread.
And also it is used inside KF5 dataengine implementation, so I'm affraid
that it could not be optimized w\o backend rewriting
