Moved CollectionExtensions.cs to Ark.Cecil.
More efficient RemoveWhere;
Refactored SetTargetFrameworkProcessor a bit.
Unified attribute handling in CecilProcessor.
Improved detection in CollectUsedTypesProcessor.
Small refactoring in CollectUsedTypesProcessor.

Cleaning _usedTypeReferences after usage.
Routing found type processing trough ProcessFoundType.
Added ReferenceSearchingMetadataResolver.