Upstream support for angel-foo input as alias for foo.

This replaces the revspace_angel plugin at RevSpace.

plugins/regex_angel

@@ -0,0 +1,4 @@
+sub command($self, $cart, $command, @) {
+	return REDO, $1 if $command =~ /^angel-(.*)/;
+	return NEXT;
+}

revbank.plugins

@@ -45,5 +45,6 @@ statiegeld_tokens
 products           # matches product IDs (barcodes)
 market             # also matches product IDs
 users              # matches usernames
-url
+#regex_angel        # matches SHA2017/MCH2022 angel badges
+url                # matches URLs
 #deprecated_raw     # matches amounts