New command line command to create data archives

[softcoder]

I added a new comandline parameter this evening that allows you to have megaglest use 7z to create 7z data archvies for: a) techtrees, b) tilesets or both.

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megaglest --create-data-archives=all

This is useful for sharing techtrees and tilesets that you have locally but other network players (nor masterserver) do not.
This is a convenience command only and i don't want to expand its usage much beyond what is already there (a shortcut for calling 7z for soem game data)

Its a good way to refresh your shared data archives when working on mod data.

Thanks