Find all Implementations on an interfaces needs defined

[kanej]

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If you trigger "Find all implementations" on the name of an interface declaration, we show all the references for the implementation including the originating interface:

There are two issues here:

• Find all implementations is really just find all references - it is not building up the inheritance tree and giving results based on that
• there is a question of what is the right thing to do - should all children of the interface/contract be shown, or just the immediate children in the hierarchy

The final implementation should:

• deal with interfaces extending other interfaces
• deal with abstract contracts
• exclude the originating interface/contract from the "implementations list"

[kanej]

I suspect we should focus our efforts on slangs usedef work to resolve this.