Introduce a base command handler and rewrite go_manage_conversation with it.
Add go_manage_router command.
Fix option handling and add better tests for it.
Merge branch 'develop' into feature/issue-612-more-organised-management-commands
Add show command to go_manage_conversations.
Add show command to go_manage_router.
Merge branch 'feature/issue-612-more-organised-management-commands' into develop