Log Message:
mikutter-plugins-twitter: update for mikutter 5.0

pkgsrc changes:
* use ${PREFIX}/share/mikutter/vendor/plugin directory for pkgsrc
  specific plugins

Summary of upstream plugin changes:

Changes for mikutter 5.0

* following-control-2.0
  list_for_profile-2.0
  list_settings-2.1
  message_detail_view-2.0
  message_retweet-2.0
  user_detail_view-2.0
 * gtk3 support
* twitter-2.1
 * update for diva 2.0
 * avoid excessive accesses to account/verify_credentials

Non mikutter 5.0 specific changes

* twitter_setting-1.1
 * restore a setting key for FilterStream connection
* streaming-2.3
* twitter_setting-1.2
 * don't exclude retweets from filterstream
 * make receiving retweets from filterstream configurable