Feature: Leaderboard enhancements

[johnnyapol]

I'm already working on some improvements to the leaderboard but I want to log when I have planned:
In progress:

• Weekly leaderboard so active players can see how they're performing

Starting:

• Adding net worth calculation (money + ore + worth + upgrade costs)

Queued:

• Add client-side sorting for the leaderboard (e.g. sort by rank)

[DamienVesper]

Client-sorting has been completed in lb-changes.