Support to extra field in Cloze note type

[scarbajali]

Quick (and dirty) implementation of #36.

• Anki plugin: add Extra field to the TiddlyRemember Cloze note type (v2).
• Tiddlywiki plugin: add extra parameter to the remembercz macro.

[sobjornstad]

Thanks for sending this over! I will take a look at it and most likely integrate this into some other changes I'm making when I get a chance to dive into TiddlyRemember stuff. Guessing that will be sometime next week.

Looking at what you have off the top of my head, changing the order of the arguments to the macro in TiddlyWiki isn't a good idea since it will break users with existing positional parameters, and I want to pull in some code from the sister project LPCG to allow updating existing note types in Anki (rather than creating an entirely new note type) when there is a simple, backwards-compatible change like this one. This is a great start though.

[scarbajali]

I changed the implementation to avoid legacy issues. So I added instead the remembercze macro that contains extra field but it doesn't support inline option, as it looks like that doesn't make sense to have an extra field in this case.

remembercz works as initially conceived, without extra field.