Change log r2:

3D Editor:
- Added Close button.
- Drop down menus backgrounds are no longer opaque.
- re-added structures.
- Added weapons' holders, intel exc to the 3D (on Dev branch).

- GUI:
- when opening a new container all other containers will be closed.
- Box Gen: Drop down menus backgrounds are no longer opaque.
- Fixed changing view mod hide the video feed.

- IED:
- Fixed non-jammable IED didn't explode.

- Mission Wizard:
- Added mini map and zone combobox.