Add support for converting selectively customized UNITDATA files.

Hey, MazeXD

First off, thanks for making the tools available. 

Here's a quick and dirty pull request to add support for selectively customized 
UNITDATA.RAW files, e.g. files whose names can be called anything, not 
neccessarily UNITDATA.RAW. 

However, I did constrain it so that the file name must at least start with "UNITDATA". 

See also: http://forums.runicgames.com/viewtopic.php?f=47&t=48200

I have bumped the version numbers of Raw2Txt, Txt2Raw and TLII.IO by 0.0.1.