If link title was not already in cache, it might get left at ??. It was not using passed title, and sometimes was not getting title from server fast enough.
- fix missing app select
- add clear button
- use request() instead of json() to query server
- add optional class property to SelectOption
- move cleaning select options to its own function so we can use it anywhere
- Use separate render to keep local / remote options separate. Local options stay in select_options.
