feat: add pet positions to walk command

Resolves #33

feat!(core): make some classes internal

feat(core): add return distance tolerance to walk commands

feat(core): make walk commands accept short positions

docs: add documentation for missing fields

fix(core): cancel player walk command on map change automatically

feat(core): add pet walk command

feat(core): add walk command for moving the player as well as pets simultaneously

feat(localclient): use take control command in local client