Adds the ability to switch parties

Jira issue: APPPARTY-61
Adds the ability to switch parties

Jira issue: APPPARTY-61
Checks for partyAddress in serviceAddress

Jira issue: APPPARTY-61
Checks wheter or not a vote was succesfull

Jira issue: APPPARTY-63
Fixes an issue where the A2A channel is not removed when navigating away from the host and guest pages on Firefox

Jira issue: APPPARTY-63
Fixes an issue that happens when the A2A service service is found twice
Fixes an issue where the party crowd list is not rendered correctly.
Clears all data of the current party when leaving a party

Jira issue: APPPARTY-61
Implements a work around for an issue where webinos service discovy does not search correctly into someone else's personal zone

Jira issue: APPPARTY-61
Removes items that belong to a user that is leaving

Jira issue: APPPARTY-61
Merge pull request #35 from eelcocramer/APPPARTY-61

Adds cross PZ support and the ability to switch parties