Clean up and organize tests + state class tests

I removed the complete create/call functionality of the FakeExtVM leaving it to minimum functionality, creating a "callcreate" in the test. Tests needing those functions should be written as state tests (new feature).
I created a lot of helper functions in order to reuse code.

Can the export function do this so importState isn't mutating irrelevant data?
Why does it need to be re-exported?