Superformat

This is a significant refactoring of view handling to make formats/views work much more like cards/events.

Until now the primary mechanism for handling sets in formats has been special method naming for views.  Now views (and other format methods) are handling by module inclusion at initialization time.

The main difference is that there are multiple format classes involved, so there are potentially multiple format modules per set.  For example, for Pointer+*type, you would have just the one "set module"

Card::Set::Type::Pointer

..but you could have many "set format modules":

Card::Set::Type::Pointer::Format
Card::Set::Type::Pointer::HtmlFormat
Card::Set::Type::Pointer::CssFormat
...

and those would need to get included in the right contexts (as they now do).

This pull request is NOT yet ready for merging.  There are still a few specs failing (7 I think), mostly because I haven't yet worked out a good mechanism for sharing view handling among different sets.  Eg many things in the file set formats need to be used in image set formats, cards with the type Set inherit functionality from cards with the type Search, etc.

Seems like a loss here, like we are losing the ability to alias views.  Even the case you implement has to do another send which can do all sorts of lookups to get to the final block to call.

Alias in ruby generally means that the referent has to be defined before we can refer, and that means that the block (lambda) is bound into some module or class by the time we do the alias.  All the new processing in method_missing does complicate the picture quite a bit.