Reimplement support for property groups, add API to show/hide groups
Summary:
Reimplement support for property groups, add API to show/hide groups
+ update the example app
+ fix doxygen tags
+ API: change some setters to slots
+ API: Rename "auto sync" to "value sync enabled" and "value sync policy"
+ Add: childPropertyItemsExpanded and groupItemsExpanded flags to KPropertyEditorView
KReport port for this API at D4047, Kexi port at D4049
Test Plan: Run the kpropertyexample, play with the 'Show groups' check box, try the --flat option, use the editors, study the new API
Reviewers: piggz
Reviewed By: piggz
Subscribers: Kexi-Devel-list
Tags: KProperty
Maniphest Tasks: T5020
Differential Revision: https://phabricator.kde.org/D3957