The visibility lock icon and help ID was accidentally
left off the PathsTreeView set-up.
The Path Attributes also used the wrong icon to indicate
the paths were locked (compared to the one shown in the
Path Attributes dialogue).
...to path.
Changes the names of
gimp_vectors_* () API to
gimp_path[s]_* (). Renames related files
to [path] instead of [vectors], along with
relevant enums and functions.