templater: add count template filter, plus tests
Previously there was no way of telling how much children or bookmarks or tags a
certain changeset has in a template. It was possible to tell if a changeset has
either 0 or not 0 bookmarks, but not to tell if it has 1 or 2 of them, for
example.
This filter, simply named count, makes it possible to count the number of items
in a list or the length of a string (or, anything that python's len can count).
E.g.: {children|count}, {bookmarks|count}, {file_adds|count}.
Testing the filter on node hash and shortened node hash is chosen because they
both have defined length.
As for lists of strings - children, tags and file_adds are used, because they
provide some variety and also prove that what's counted is the number of string
items in the list, and not the list stringified (they are lists of non-empty,
multi-character strings).
Additionally, revset template function is used for testing the filter, since
the combination is very flexible and will possibly be used together a lot.
(The previous version of this patch had an incorrect email subject and was
apparently lost - patchwork says the patch has been accepted, but it's not so.
The changes between that and this patch are minimal: now the filter does not
disturb the alphabetical order of function definitions and dict keys.)
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