Refactor tiddlers (shadow and filesystem) in svn so they are not one gigantic line

[BobMcElrath]

Large shadow tiddlers such as StyleSheetLayout? (etc.) are just not maintainable as stored. Any change in any shadow tiddler results in the entire shadow tiddler being replaced.

Instead, we should store shadow tiddlers as actual tiddlers. We should use a separate file for them that will be mixed in with 'cook'. Fixing #175 will allow tiddler files in svn to be stored with the proper whitespace (no escaping).

We should then add a new directive to cook: 'shadow' that will add the tiddler to config.shadowTiddlers.

[MartinBudden]

Rather than cooking the shadowtiddlers directly into config.shadowtiddlers they could be stored in their own div in the TiddlyWiki file (say <div id="shadowArea"> analogous to the main storage area <div id="storeArea">). At startup a loadFromDiv could load these and then assign the contents to config.shadowtiddlers.

[JeremyRuston]

Part 1 implemented in changeset:1077

[MartinBudden]

After a review on 11 Mar, 2007, I'm declaring this ticket fixed: we have implemented all of this and shadow tiddlers are now easily maintainable with an editor.