Pathfinding is very much not done, but it works enough and I want to get this merged.
TODO: fast replanning, goals that aren't a single node, falling moves (it should be able to play the dropper), parkour moves
* make reading use thiserror
* finish implementing all the error things
* clippy warnings related to ok_or
* fix some errors in other places
* thiserror in more places
* don't use closures in a couple places
* errors in writing packet
* rip backtraces
* change some BufReadError::Custom to UnexpectedEnumVariant
* Errors say what packet is bad
* error on leftover data and fix
it wasn't reading the properties for gameprofile
