add platform search support to onionoo
The new functionality should be able to answer the following questions/examples:
- show only linux/windows/freebsd/openbsd/sunos/.. relays
- show *BSD relays
- show only relays running tor 0.2.5.10 (or 0.2.5.x)
- show only relays running tor versions newer/older than v0.2.5.9
- combinations: show me windows relays running tor older than 0.2.5.10
use cases: - search for outdated/affected relays - track platform diversity
https://lists.torproject.org/pipermail/tor-talk/2015-February/036874.html