Cross reference (`\x` macro)

Every macro in OurBigBook can have an optional id and many also have a reserved title property.

When a macro in the document has a title argument but no id argument given, get an auto-generated ID from the title: automatic ID from title.

Usually, the most convenient way to write cross references is with the insane syntax with delimited angled braces:

<Cross references> are awesome.

which renders as:

Cross references are awesome.

The sane equivalent to this is:

\x[cross-reference]{c}{p} are awesome section.

which renders as:

Cross references are awesome section.

Note how that is more verbose, especially because here we use both the \x c argument and \x p argument to capitalize and pluraize as desired.

Another sane equivalent would be to add an explicit link body as in:

\x[cross-reference][Cross references] are awesome.

which renders as:

Cross references are awesome.

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