Add copy and paste states/connections

[yuberee]

Only copies and paste the states and their connections between each other, so it doesn't include connections that have no end/start state.

Would be useful for reusing some logic, might be troublesome to carry over references, for example if you're referencing the NPC Component inside a state it shouldn't copy that reference but instead reference the NPC Component on the new state machine where this was pasted.

Just a thought :)