Plugin system

[nrobinaubertin]

Zusam should be tiny, stable and extensible. For that to be true, we need a good plugin system.
A document should also be written to identify what should be core and what should be a plugin.

[briaeros]

For the document, it could be useful to specify on what functional part of zusam a plugin can be possible. It will also help define what's in the core (and what service it brings).

In addition defining a standard way of storing/getting the data from/for the plugin (I propose a json dictionnary as it's well accepted by javascript, and sqlite even get an JSON extension to help request or insert).

In addition, I think that "plugin accessible data" must be created for at least 3 specifics objects

• the metadata of the "data" (adding/showing tags or other specific data linked to a picture/movie/...)
• the groups ( adding rights/acl to control if a user could invite someone or could upload data )
• the users ( user-wide settings for a plugin)