Require module namespaces for plugin modules

[anne17]

Our own plugin modules could use the namespace sb or sbx.

[anne17]

It's difficult to enforce obligatory namespaces because module names are Python identifiers (i.e. consist of alphanumeric characters and underscores) which makes it hard to decide on a naming convention. There is no special character that can be used exclusively to divide the namespace from the name.

[kod-kristoff]

Does this also apply to annotations?
That is should it be sbx_word_predictions_kb_bert.sbx-word-predictions--kb-bert?

[MartinHammarstedt]

No, annotations automatically get the plugin name as a prefix (or rather, the part before "." doesn't get removed) in case there is a conflict with another annotation name.