Hotfix for silly runners getting stuck again, plus new text outline system

Smaller patch to rush out the hotfix for the silly runners:

- Possibly fixed the issue with runners sometimes getting stuck near the stash or below the mountain. It wasn't clear to me what exactly caused it, so I made the code more robust and added a few safeguards, which should hopefully prevent it, but if it doesn't please report back to me. 

- New text outline system, with substantially better performance, and it now actually outlines all the text elements.