IDEA-134572 Watch edit by mouse click is triggered when it should not
rename to read*
IDEA-134657 gradle: test resources should appear earlier than production resources in test classpath
gradle: unused code removed
PY-14774 Hide annotations for *args/**kwargs parameters in "Change signature" dialog

It was done already for normal (not starred) parameters of function.
Validation of names (parts after leading '*') for such parameters is
performed now as well.

I've also added a few more warnings in "Change signature"
dialog, namely:

* Multiple parameters with single or double star
* Several starred parameters have the same name