[Enhancement] Improve ui on small touchscreens.

[IMbackK]

Hi

Files is over all quite nice on a phone see it running on a motorola droid 4 with maemo leste here: https://uvos.xyz/2020-06-17-200351_960x540_scrot.png
(using qt 5.11)

but there are some wrinkles:

• Openig a file or folder dosent highlight the file or folder, there is no feedback that anything happened until the application handling the file type is launched
• there is no way to get into the file properties using the touchscreen
• the file properties pannel way to large on a small screen, it should be fullscreen on a small screen, not a pannel.
• there is no easy way to close the properties
• the places panel can not be hidden, this makes using the application in portrait mode impossible