connected v0.7.2

Connected changes for v0.7.2:

• fixed behaviour when clearing Organize node's text content
• fixed missing Switch node
• fixed errors with undo/redo and connections
• added Focus On Selected, which zooms and pans to the currently selected nodes
• changed hotkey for Focus On Start to Shift + F, hotkey F is for Focus On Selected now
• changed behaviour of duplicated and copy-pasted nodes, they now spawn at the position of the mouse cursor