work on 3DMEditor

[zuzuf]

I am rewritting 3DMEditor's interface using the new functionalities of the GUI module. So currently its interface gets converted to a TA style interface. The GUI module is being improved too with a file Dialog function that will only show the open_dialog.tdf window and change its title and other data ... All those old functions used only by 3DMEditor's interface are going to disappear since new ones can replace all of them.

[milipili]

Once the first new alpha version, Tell when it could be fully tested (to check it on OS X for example ^^)

[zuzuf]

Ok. I think I can finish rewritting GUI this week end, but maybe not cleaning the whole 3DMEditor's code or add support for new 3D formats, etc... expect me to add some more functions to GUI module