New tool for Design Center sketches installation or upgrade.
@cfdc-upgrade [-v] DEST PATH-OR-URL@
Require @PATH-OR-URL/cfsketches.json@ to be found and valid JSON. Copy any sketches listed there (as described by the DC manifest format) to @DEST@. If all the copies succeed, copy @cfsketches.json@ to @DEST@ as well.
With @-v@, list every sketch and every file copied and the outcome.
Return 0 if successful, 1 otherwise.