Add "Navigation" group to ContextMenuExtension
Summary:
This patch adds new group to ContextMenuExtension for grouping corresponding actions. Current version places such actions to "Extension" group, which also populated by other common actions which leads to "mix" of actions with different sense.
Old menu:
New menu:
Test Plan: Tested with master branch
Reviewers: KDevelop, kfunk
Reviewed By: KDevelop, kfunk
Subscribers: kdevelop-devel
Differential Revision: https://phabricator.kde.org/D4983