Adding and deleting edges don't affect loaded edges array on GPNode

[mikeland73]

Proposal

• If removeAll is called then set loaded edges to empty array (if loaded)
• If removeEdge is called, remove that edge from loaded array (if loaded)
• if addEdge is called and that edge type is loaded, add that edge to loaded array.

@WilsonGregory

[WilsonGregory]

This all makes sense to me, it reduces the need for a bunch of saves. You can do a bunch of operations, and then save at the end.