Migration from other LMS platforms

Problem/Motivation

Allow migrating trainings (linear LP->modules->activities structure, user result data) form Other LMS platforms.

Generic migration destination plugins

Activity destination plugins
Answer destination plugins
Course/training destination plugins
Module/lesson destination plugins
Course/lesson status destination plugins

Opigno and LMS 0.2.x branch source destination plugins

Activity source plugins
Answer source plugins
Module/lesson source plugins
Opigno training content source plugins
Course/lesson source plugins

There may be other sources/destinations for other contrib modules, e.g. we need to confirm whether there are already group, group membership, group membership request source + destination plugins.

Opigno migration templates

Migration templates using the above.