Make sord_node_get_counted return byte count

Also clarify formerly ambiguous documentation, and add
sord_node_get_string_measured to get both byte and character counts.

Technically, this breaks behaviour, but most (if not all) existing code
that uses this function was actually expecting a byte count.  This is
unsurprising since a UTF-8 character count is almost always useless.
This approach causes less problems in reality, since it fixes broken
behaviour in the wild without requiring any changes in user code.

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