Adjusted position of victory inventory
Created inventory
Disable Inventory

Will be enable once there is game mode requiring it.
Update levels to not collide with HUD
Corrected spelling of properties
Gui upgraded from pygtk2 to gtk3
Support for adding description about molecules
HUD will now print description for last selected molecule
Added scrollbar to description in cmleditor
migrated gui.gtkbuilder to gtk3 only
Made it possible to select license for description
Added molecule description for H20 and CH4
Written description for all elements used by level 1-7