Tiled 1.2 Beta released

At long last it is almost time for Tiled 1.2! But before we get there, we will still need some time for fixing bugs, updating translations and acting on last-minute feedback from those using the development snapshots. The latest snapshot (version 2018.08.22) is considered a Tiled 1.2 Beta release.

This is a companion discussion topic for the original entry at https://www.mapeditor.org/2018/08/22/tiled-1-2-beta-released.html