Collect stats

[Vivelin]

I almost can't believe we don't have this as an issue already, but:

It'd be cool if we could automatically collect lifetime item pickup statistics. If we record the time every time we collect an item, we could have Tracker lines for new types of events:

• Fastest
• Slowest
• "Picked your 69th morph ball."
• "You usually have a sword by now." (if more than the average time has passed for that item)