Changes

Whitespace
 (commit: 7f84a46)

Allow warnings
Cache generation can proceed but the user will be alerted.
 (commit: 7d2507a)

Make ArrayEnumerator more versatile
Now optionally accepts start index and length
 (commit: 106581c)

Tag, TagList, TagListParser
A lot of things in MM are structured like :tag[value]trailer and this
formalizes that structure
 (commit: ee3e340)

Restructure patch building
Lots of changes
* Parsing/validating patch is now separate code
* Less code in the patch extractor (may even be able to go away entirely
with some simplifications)
* Pass specifier is now an explicit concept
* Needs checker is now an object and has a cleaner interface
* Some things which were errors before are now just warnings
 * If there is more than one pass specifier it will take the first one
and warn
* Syntax for root patch names is much more formal now, this might break
some unusual cases that are silently accepted now
 (commit: f5127b1)

Make extra colons a warning rather than an error
Been seeing a lot of these and the correct path is determinate
 (commit: 387ed74)