The gui should wrap a long report message in the case where it would overhang

[vodorok]

Right now it is hard to understand a report when relying only the report tree view (left side of the report view) The issue is most apparent when viewing an "non-modified" Cppcheck report, where the diagnostic message is not added to the bug path as the last element. There, a long error message could only be read, when the side panel width is enlarged by the user.

A proposed solution would be to add a button to enable wrapping of long messages, and also display the message when hoovering on an item.

This is a follow up issue to #3680.

[whisperity]

Partial duplicate of #3060.