Add support for Apple context menus in matrix items list screens

[gileluard]

Hypothesis

Following Apple's HIG where possible we help people know how to navigate and use Element on iOS.

Proposal

Support context menus where people might expect them, eg

• Room tile in a tabs/home
• Room tile in search screens

Examples

Room tile on tab

On a tab, currently a long press leads to a different background for the relevant room tile.

Control

Idea 1

Idea 2

[gileluard]

@nadonomy @kittykat @amshakal here are the possible context menu with previews we could have:

• Home
  

• Favourite
  

• People
  

• Rooms
  

[gileluard]

Also I managed to use the fancy custom navigation animation provided by Apple when the user taps the preview