Issue #45: Improve execution time in large assemblies

[mchaloupka]

The usage of seq caused the reflection to be done repetitively for all operations. I have improved the execution time of the tests in the provided project (see issue) from 12 seconds to 1.4 seconds just by making this tiny change of materializing the sequences into lists. I had to materialize it in two places:

• The moment where we filter out all methods that are attributed by one of the event attributes.
• The place where we select events in-scope for a given scenario

[bartelink]

Wow, nice work to figure out such a productive change

[mchaloupka]

I have done further improvements to scan through the methods less times (it gets the time for the example project under 900ms).