historically, Libervia (SàT before) was using camelCase as allowed by PEP8 when using a
pre-PEP8 code, to use the same coding style as in Twisted.
However, snake_case is more readable and it's better to follow PEP8 best practices, so it
has been decided to move on full snake_case. Because Libervia has a huge codebase, this
ended with a ugly mix of camelCase and snake_case.
To fix that, this patch does a big refactoring by renaming every function and method
(including bridge) that are not coming from Twisted or Wokkel, to use fully snake_case.
This is a massive change, and may result in some bugs.
- new Pubsub invitation plugin, to have a generic way to manage invitation on Pubsub based
features
- `invitePreflight` and `onInvitationPreflight` method can be implemented to customise
invitation for a namespace
- refactored events invitations to use the new plugin
- a Pubsub invitation can now be for a whole node instead of a specific item
- if invitation is for a node, a namespace can be specified to indicate what this node is
about. It is then added in `extra` data
- an element (domish.Element) can be added in `extra` data, it will then be added in the
invitation
- some code modernisation
