FileExplorer

* implementing Fileexplorer ( new map ) .
Kown bug : loosing focus when you click for the second time new map
* finishing implementing the GUI
File explorer added ( new map )

Known bug posted as issue .

finished gui implementing
Dem reader implemented

reads .lbl files
- create a .nfo where the map infos are
- create a .bmp img of the terrain ( takes 1Min 20sec on my PC)
Gui finished !

Only need the 3D now ...
Only glitch : openfiledialog ...
Mergin'