introducing an additional class mode: group work

[klaraschlueter]

Die Schüler werden zufällig in Zweiergruppen aufgeteilt. Jede Zweiergruppe hört und sieht den jeweiligen Partner und nur den jeweiligen Partner.

Der Wechsel zwischen den Modi wird in #33 implementiert.

[fabianmalinowski]

• teacher can switch class mode to "group work" (and back to "whiteboard mode")
• in group work mode pupils can communicate in groups of two, selection is random at first
• pupils in a group can see and hear each other.

[fabianmalinowski]

• teacher can switch class mode to "group work" (and back to "whiteboard mode")
• in group work mode pupils can communicate in groups of two, selection is random at first
• pupils in a group can see and hear each other.