this is the continuation of @abalaji's work in the patch https://phabricator.kde.org/D12162.
with this patch dolphin support now following touch gestures:
* Tap gesture to interact/open with directories, files and so on
* TapAndHold and release gesture for access to the context menu (main window, panel folder, places and information)
* TapAndHold and moving gesture for drag and drop action (main windows, panel folder and places)
* pinch gesture for zoom in main window
* kinetic scrolling (QScroller) for main window, panel folder, panel places, panel information, setting preview and service
FEATURE: 385066