Support plaintext .sdb files about sdb HOT 1 CLOSED

some_key=some_val                             # a record in the root namespace
something\nwith\nnewlines=val\nwith\nnewlines # newlines separate different records, so must be escaped
key\=with\=equals=val=with\=quals             # = must be escaped in the key, but in the value it's optional
key\\with\\backslash=val\\with\\backslash

# completely empty lines are ignored

/subns                                        # lines beginning with '/' and no '=' enter a new namespace (path is always absolute to the root)
key_in_subns=val_in_subns

/subns/deeper                                 # deeper nesting (again, path is absolute)
deepest_key=deepest_val

/weird\=ns\\\nwtf                             # namespace names use the same escaping as keys ...
\/justa_key=henlo                             # except that keys must always escape the first char if it is a slash

/                                             # return to the root namespace (do we want to allow multiple places for a single ns?)
key_in=root