BattleMetrics Hour Summary troch jxtt_dev

Adds an Hour Summary section to a players BattleMetrics page, which shows the following:
- Total number of hours a player has on servers tracked by BattleMetrics
- Previous usernames on servers tracked by BattleMetrics
- Estimated time played on servers tracked by BattleMetrics in the previous 2 weeks
- Graphs of a players playtime by date

For more information visit: https://github.com/jxtt-dev/battlemetrics_hour_summary