Fixes pipe bug.
Issue https://github.com/tgstation/-tg-station/issues/1669 and its duplicate https://github.com/tgstation/-tg-station/issues/1099
Fixes the HE pipes.
Re-added mode.txt. Added it to the ignore list.
Merge pull request #1799 from Giacom/readd_mode

Re-added mode.txt. Added it to the ignore list.
Merge pull request #1777 from adrix89/pipeFix

Fixes pipe bug.