Simplified the assembly searching within packages

It's now more direct in what paths it wants to search for instead of
relying on the AppDomain setup to be completed. Allows us to unit test
it better and provides a more strict isolation to a single method
instead of the process leading up to the method.
Fix for missing Procon.Core on initial install/update
Cleanup for remote tests

They all use the same port now, so they must cleanup for the next test
to be able to bind to it