[SPG]

Get updating !

- version .54
Fixed moving multiple tiles - tiles no longer shift relative to one another when dragging.
Fixed problem where older missions that were in tile or node mode when saved will work properly when loaded now.


- version 0.53
Fixed tile flipping buttons - they now flip on the correct axis.
Tile selection will be reflected correctly.
Selecting a new tile won't leave an artifact tile on the screen.
Mouse rotate now works with tiles.
The nudge and rotate keys now work with tiles.
Cleaned up tile editing mode behavior. Shouldn't have strange effects when changing modes or view modes now.
Added code to reset the detail cache when dragging tiles. This will hurt performance, but will now correctly render tiles that 'mow the lawn'.
Fixed tile drop location (incorrectly offset one meter before).