Break blocks from near to far, place blocks from far to near. Support…

[0xhtml]

… replaceable blocks. e.g. don't mine single layer snow before placing

[ZacSharp]

This completely breaks breaking replaceable blocks.

0001-0200.mp4

Besides that, it would be nice if you split your changes into multiple commits. Changing the iteration order is mostly white space changes (plus the new fields), but since you combined it with moving lots of checks around it is hard to see what you did.

Also, since you combined int triples into BetterBlockPos wherever you came by one, I'd like to let you know that using ints in places which are executed a lot is done intentionally to avoid allocating and throwing away a thousand BetterBlockPos objects per tick. Obviously, allocating the same position multiple times is right against that goal.