Tag IDs cannot start with 0 (zero) character

[gronka]

Using diet-ng 1.3.0

Sorry if this is a bit brief. Seems like a straightforward bug though. The following fails to build, apparently due to the id beginning with "0":

select#timezone(name="timezone")
    option#0000(value="0000") GMT Casablanca, London, Lisbon, Monrovia
    option#0060(value="0060") GMT +1:00 Amsterdam, Berlin, Madrid, Paris, Rome

Part of the error message:
Compiling Diet HTML template event/create.dt...
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/defs.d(34,3): Error: "pieces/timezone.dt(15): Expected identifier but got '0'."
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/parser.d(1369,13): called from here: enforcep(accept_empty || start != idx, delegate string() => "Expected identifier but got '" ~ s[idx] ~ "'.", loc)
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/parser.d(1051,26): called from here: skipIdent(input, idx, "-_", loc, false)
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/parser.d(992,15): called from here: parseTag(input, idx, ret, has_nested, loc)
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/parser.d(950,38): called from here: parseTagLine(input, loc, has_nested)
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/parser.d(65,76): called from here: parseDietRaw(f)
/usr/include/dmd/phobos/std/algorithm/iteration.d(597,19): called from here: __lambda2(front(this._input))
/usr/include/dmd/phobos/std/array.d(106,9): called from here: __r6554.front()
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/parser.d(65,81): called from here: array(map(files))
../../.dub/packages/diet-ng-1.3.0/diet-ng/source/diet/html.d(93,90): called from here: parseDiet([InputFile("event/create.dt", ......................

Workaround for now is to simply use:
option(value="0000", id="0000") GMT Casablanca, London, Lisbon, Monrovia

[gronka]

HTML5 at least now allows ids comprised entirely of digits
https://www.w3.org/TR/html5/dom.html#the-id-attribute

It seems the old restriction that an id must start with a character is gone (although I now wonder if that 'character' could have been a zero. I assumed not... oh well).