lang: parse, core: world: Add a collect package

This lets us look at the available resource data for collection, and to
filter it so we can decide what we want to collect on our machine.

Other types of collect functions could be added in the future.

lang/parser/parser.y

@@ -1491,6 +1491,12 @@ undotted_identifier:
 		posLast(yylex, yyDollar) // our pos
 		$$.str = $1.str
 	}
+	// a function could be named collect.res()!
+|	COLLECT_IDENTIFIER
+	{
+		posLast(yylex, yyDollar) // our pos
+		$$.str = $1.str
+	}
 ;
 var_identifier:
 	// eg: $ foo (dollar prefix + identifier)