Borer fixes
```yaml
changes:
- rscadd: "Borers receive a brief instructional greeting and receive objectives."
- bugfix: "Borers and host brains can communicate properly now."
- bugfix: "Borer chat is propagated to ghosts and fellow borers properly."
- bugfix: "Borer chat is stripped of the beginning ;."
- bugfix: "Standardized borer vent-crawling, now uses same system as other vent-crawling mobs."
```
Merge branch 'Bleeding-Edge' of github.com:d3athrow/vgstation13 into fix-borers

Conflicts:
	html/changelogs/N3X15-fix-borers.yml
Redo changelog.
Double-returns
Class rather than style.
Merge pull request #1903 from N3X15/fix-borers

Borer fixes