Enhancement: Show "More" button for every file list item

A 3-dot button has been added to every file, where the options that we have
in the 3-dot menu in multiselection for that single file have been added for a
quicker access to them. Also, some options have been reordered.

https://github.com/owncloud/android/issues/2885
https://github.com/owncloud/android/pull/4076
