Don't require embossers to publish internal tables

[joeha480]

Embossers are required to publish internal tables in order to be used with it.
Instead, the embossers could provide the list of internal tables directly.
These could be set by identifier.

The current mechanism is only used if the embosser allows other tables and
should be set using a Table instance.

[joeha480]

There's a potential problem with solving this. Since all tables currently published are available to any implementation, this is exploited by some users who prefer to use the GenericEmbosser (which accepts any table) over the make specific implementation to which a table belongs.

[joeha480]

Replaced by brailleapps/dotify.api#20