• fix #1760 removable:true working again (broke in 4.x)
• fix #1761 staticGrid(false) will now enable drag in behavior (if set)
• fix #1767 locked item can be user moved/resized again, just not pushed by other nodes (broke in 1.1.1)
• fix #1764 destroy(false) can now re-init properly (doesn't force static grid)