more options for the map preview

[Baŝto]

Something like --preview-map=mapname=tileset=tech could it make easier to test and take screenshots of maps, which are not destined for megaglests default tech and tileset. Tileset and tech should be optional.

I also could extend the preview feature with dialog for tileset and tech in the Qt-version of the map editor.

Does somebody oppose this feature?

[titi]

good suggestion! Maybe something interisting to do  for my son ;-)
( I bumb this up )

[titi_son]

Son finished it :D

Will make a pull request tomorrow.
EDIT: Pull request is now there.