Rotate/Flip Map or Layers

[Chaoseiro]

This is something I found would be useful for some maps I'm working on, where sometimes I need to have the same map but flipped on X axis.
For example:

This feature, combined with pull request #866 would make it much easier to flip layers or the entire map, I believe.

[bjorn]

It is already possibly to quickly flip a layer by grabbing it (so that the part you want to flip is on your brush) and then pressing X or Y to flip the respective axis.

However, at the moment this always also flips the actual tile graphics, which seems to be not what you want. Though without flipping the tile graphics, your corners as well as the slanted roof tiles would look all wrong, unless Tiled knows how to match them up. But I guess, here is where #866 comes in.

I'll consider this a feature request for flipping without actually affecting the tile graphics.

[bjorn]

Issue came up on the forum.