1.4.3

Change set since 1.4.2:

3cc04dc: Version bump to 1.4.3
6ac52eb: Some simple clean up
a530417: 马雷说有四种收银台，我差点疯掉
7ebc06c: Only allow horizontal facing
ac096f6: Oops, I implemented the wrong thing, but I accidentally implemented another TODO.
1cd776f: Consumable wand
a1aedec: Mimic vanilla observer behavior in register block
c55f8dd: 无界面交互的收银机（初稿）
1e2d89e: Mimic what vanilla does
e3e2eed: Yes it is correct