Support for multiple metatypes

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The way patterns are formatted and handled does not account for cases where there are elements with multiple metatypes. As an example of using multiple metatypes, the SysML stereotype TestCase has two: Behavior and Operation

[LostIndeterminateParticle]

After some more messing around, I was able to get TestCase to work in patterns that used only the metatype Activity. Test Cases are currently the only case I have dealt with that use two metatypes, so this might be a non-issue