Merge branch 't/11044'
Made checkWidgets method fire event.
Changelog entry and small reorganisation.
Merge branch 't/11244'
Renamed: Plugin icons.
Renamed: Toolbar button.
Renamed: Context menu.
Renamed: Widget.
Renamed: Internal CSS classes.
Renamed: Plugin helpers.
Cleanup: Dev sample.
Disable Image plugin when Image2 is to be loaded.
Cleanup: Don't use removePlugins in samples since Image is disabled automatically.
Disable ImageButton when Image2 is to be loaded.
Added comments for odd hacks.
Simplified definition of Image2 dialog.
Fixed: Broken dialog tab navigation when Browse button is visible.
Reverted and made the hack for dynamic Browse button more friendly.