4 opcodes for 4.1.0

Closes #103
Do not create UPDATE queries if WDBVerified in database is higher than current sniff build (for wdbtemplates)
Remove "None" from enum SQLOutput as it was causing some issues and it is not required

Note: Enum.GetValues/Names(typeof(SQLOutput)) were putting "None" at the end of the array, not start
Fix a typo in a 5.1.0 opcode
Remove a 5.1.0 duplicated opcode
Connect to database also when dump format is sql only
Fix a possible crash in CompareDicts<T, TK> and CompareDicts<T, TG, TK>
Actually use SQLFileName from config as a global sql
Fix a stupid mistake in previous commit
Fix a typo in gossip SQL building
Fix a logic error that would wrongly skip some packets (like .pkts without header files, from splits)
Add Remove() method to StoreDictionary and StoreMulti
Compare equipments with current DB data and do sql update or insert queries accordingly
Add experimental points_of_interest sql building
Fix build
Add missing call to UnitMisc.PointsOfInterest
Fix a crash in CreatureEquip() sql building
Skip equipment sql building if it only has 0s
More stupid mistakes fix..