Manage unfetchable options/filters

This kind of options/filters are only applied to local content, without
specific fetch
Add non-fetchable "forks" options to a user's repositories
Add non-fetchable "forks" options to a user's stars
Make filters/options work for forks when all loaded
Add a "hide never updated" local filter for forks
Ability to filter events by type
Filter events only if at least one but not all are selected
Ability to filters account repositories or stars by language
Language filter is now a simple select, not a multiple-one

(But with a "all languages" option selected by default)
Event-type filter is now a simple select, not a multiple-one
Add a "All but stars" to the list of type-event filter
Manage some old events (or old version of events)

- Old version of PushEvent, with "shas" instead of "commits"
- Old version of ForkEvent, with the id of the forkee instead of a dict
- Old ForkApplyEvent event