Release v1.5.0

Probably time for another release

• Fix players being skipped due to rate limiting in rare cases
• Fix map star rating rounding error
• Fix map quick start regulation bypass
• Validate map mods after match start
• Better handling of Bancho's spam protection
• Increase message history in lobby page
• Handle statistics with Prometheus
• Add !mapstats
• Add star rating to banner
• Add new player banning system
• Add map time left command
• Add match start time to statistics
• Add support for !commands