Nuklear Node Editor

This is a heavily extended version of Nuklear's node editor available in the demo directory.

Features

• Multiple instances - no global state.
• Unlinking.
• Link snapping.
• Switching link places on the same node.
• Nodes with infinite amount of input slots (up to a settable hard limit).
• Node deleting.
• Custom draw functions per node.

There is also a number of things fixed in the node editor (like grid moving the opposite side when moving the window around), as well as other changes that I forgot to mention.