By rearranging the `[all[]]` operator we are able to ensure that shadow
tiddlers get processed before ordinary tiddlers. This makes it easier
to create custom stylesheets that override the core.
These tiddlers were being handled as `<script>` tags to make it easier
to debug them. But in fact modern dev tools are quite happy to debug
code that has been eval’d, and this arrangement was causing problems
for importing.
Fixes#335
