Added source code GitHub link
Added v4 version tag

Hopefully fixed loading issues when returning to a run

Fixed bugs below:
- Hud size doesn't always update straight away
- if returning to a run, the figures aren't always accurate until one of the drillbert family changes state (falling / sleeping / scared etc)

- Removed number of Drillberts counter as this is shown by how many drillberts are visible in the Hud
- added zz to sleeping drillberts