Create Fly: Unofficial port

Create Fly: Unofficial port (Minecraft 26.3) — 6.0.9-unofficial.2 Fixes from your comments, thank you all for reporting!

Train schedules: you can add stops again. Left-clicking "+" (and editing, moving, duplicating or removing entries and conditions) did nothing, and left-clicking a removable wait condition deleted it instead of opening it. Minecraft 26.3 numbers the mouse buttons differently. The Stock Keeper's category screen had the same problem. Trains no longer stutter while you sit in a seat. In 26.3 the server snaps a vehicle back when a passenger reports its position; carriages no longer send that. (Thanks to user_vij5byujz9o9b9oz for tracking this one down.)

Schematics: holding Alt opens the tool menu and releasing it closes it again, so Ctrl + scroll (move, rotate, flip…) works properly. 26.3 delivered every key event to Create as "released + pressed". The same fix applies to the toolbox and wrench radial menu keys. Schematic previews now show water and lava.

Notes: Source code: https://github.com/zedekvdb/create-fly-unofficial-port