Customizable tooltip for "Force Full Update" action in the Problems View

Summary:
The patch provides ability to changing to tooltip for "Force Full Update" action (button) in the Problems View for some problem model. The patch main goal is to fix poor default tooltip for necessary models, for example from cppcheck or valgrind plugins. Current version always uses tooltip "Re-parse all watched documents", which looks strange for such problem models. With new mechanism the plugin can produce custom tooltip for it's model, for example something like this: "Re-run last analyze with FOO tool".

Default (OLD) tooltp:

Custom (NEW) tooltip:

Test Plan: Tested on master branch with kdev-verapp plugin

Reviewers: KDevelop, kfunk

Reviewed By: KDevelop, kfunk

Subscribers: kfunk, kdevelop-devel

Differential Revision: https://phabricator.kde.org/D4682