Speed up event processing speed for subdomain enum modules

[TheTechromancer]

When processing incoming events, subdomain enum modules perform a secondary check for wildcards. Is this necessary?

[TheTechromancer]

We still need to implement wildcard caching on the client side of the DNS-engine.

[TheTechromancer]

#1618

[TheTechromancer]

This is partially fixed in #1617 with later plans in #1618.