Handle tiles not fitting in standard grid.

[Corun-Kail]

Sometimes png of maps don't exactly align to the grid - for example there is extra half or quarter tile on each side of map, which makes fitting it inside Tactical Map screen impossible without editing the image. I could not find in-program workaround in current release.

It would be very useful to have at least some of the following:

• Allow cropping tiles when importing them.
• Allow to move tiles pixel by pixel, instead of tile by tile.
• Option to use fractions when setting size of the tile.
• Some tool to scale tiles in Map Editor.

[andyaiken]

This would be good to have, I've wanted to do something like this for a while now.