Gallery - context menu (delete only) #952
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closes #944
This PR adds a context menu to the GalleryViewController. The context menu only shows delete-action (as required in #944) but can be easily altered with other options like sharing images etc.
Since iOS13 apple introduced a new type of context menu, so I implemented two context menus that are shown depending on the iOS version. To review I suggest using an iOS12 simulator.
I had to move the
prepareContextMenu
-method in chatList to viewWillAppear. Otherwise the menu manipulation inGallerViewController
would override the ChatList's context menu.iOS12-style context menu

iOS13-style context menu
