blendertools: fixed inertia object creation
blendertools: fixed problem with mass calculation calling deprecated function
blendertools: layers to add objects on are now activated before object creation
blendertools: parse link/joint/motor-specific information
blendertools: made terminal output for dictionary creation and export nicer
blendertools: inertia calculation now works (still not verified)
blendertools: changed inertia property from string to list
blendertools: updated gui and added separate mesh export option