Move SQL queries to a separate thread

[renbinden]

Queries are currently being done on the main thread - this should be changed.

• [x] auctions
• [x] banks
• [x] block logging
• [x] characters
• [x] chat
• [x] classes
• [x] crafting skill
• [x] drinks
• [x] economy
• [x] essentials
• [x] experience
• [x] feature flags
• [x] food
• [x] item quality
• [x] languages
• [x] locks
• [x] moderation
• [x] monsters
• [x] payments
• [x] permissions
• [x] players
• [x] professions
• [x] rolling
• [x] selection
• [x] shops
• [x] skills
• [x] stat builds
• [x] stats
• [x] stores
• [x] trade
• [x] travel
• [x] unconsciousness