Display meeting listings in tabs on the homepage of the application

[lucaa]

See the discussion about new homepage implemented for #41 and solution described starting here https://github.com/xwikisas/application-meeting/issues/41#issuecomment-740509283 .

[lucaa]

Tab names for the french translations:

• (Réunions) passées (past meetings)
• (Réunions) à venir (future meetings)
• Calendrier

The best for the meetings that have started and now yet ended is probably to have them in both future and past lists.

[lucaa]

Note: it would be interesting to be able to configure the default tab for this homepage, per wiki, by the wiki administrator (not the user).