Changes
MENU: '''View → Pan View'''
KEYBOARD SHORTCUT: '''{{key | Shift+RMB'''}}
FUNCTION: Moves the viewport around while the mouse is dragged
MENU: '''View → Merge Viewport'''
KEYBOARD SHORTCUT: {{key | End}} '''End Key'''
FUNCTION: Merges the four-port view into the normal single-port view
MENU: '''View → Set View → Perspective View'''
KEYBOARD SHORTCUT: {{key | Home}} '''Home Key'''
FUNCTION: Sets an isometric view of the physical structure on an XY-plane
