MastodonBee - Account mapping fix and enhancement in events

[corrantho]

• Fixed account mapping for reblog and mention events.
  • Used notif.Account instead of notif.Status.Account
• Extended follow, favourite, reblog and mention events with two new fields display_name and acct respectively mapped to the same mastodon API fields
• breaking modification (to be consistent with Mastodon API) on follow, favourite, reblog and mention events:
  • re-mapped username from mastodon API fielddisplay_name to mastodon API field username.

Solve issue: https://github.com/muesli/beehive/issues/356

[muesli]

Thank you!