~ecs/tm

ref: 0022137d89f12741ac3e6cf4173aa876cda5a726 tm/tm-update-ref -rwxr-xr-x 297 bytes
Fix shellcheck warnings

And disable them when necessary. This is all dumb and terrible and I
hate this world and I really really should've used a real programming
language instead of shell why did I do this to myself.
update-ref: index is a normal ref now
resolve-ref: initial commit

Replaces resolve_ref in lib.sh
update-tree: create nonexistent files/directories
update-tree: initial commit
Fix handling of ambiguous ref prefixes
insert: handle trees
Rewrite in POSIX sh

Also don't compress objects and make a few other small changes to the
spec.