Additional Pipes for Buildcraft

This release has been in private beta for a while now and seems to be close to working, so I'm going to throw it up here for now. 

• Add an entry to the BC guidebook showing how to make the Teleport Pipe
• Fix inability to open GUIs in BC 7.99.15
• Add tooltips to all pipes
• Fix a few bugs related to duplicated teleport pipes in the teleport management code

Known Issues

• There is a dupe bug where teleporting liquid through Fluid Teleport Pipes increases its volume by about 10% 
• The Teleport Tether is totally nonfunctional, and has been since day 1 of the MC1.12 port. My earlier testing on it turned out to be flawed -_-
• People have been reporting issues where Teleport Pipes do not obey their frequency settings and just spit items on the ground. If you encounter this issue, and you are in singleplayer, please please please send me your fml-client-latest.log and, if possible, your world file

For documentation, until I get around to making a Minecraft Forum thread, please check the old archived forum thread.

Requires Minecraft 1.12.2, Buildcraft 7.99.15+, and Forge #2544+.