Filter climbs by hand set

[lemeryfertitta]

After using the TB2 a bit, something that would be nice is the ability to filter climbs that only use wood hands for when skin is low. It is possible to get a subset of these climbs in the app by creating a wall which only has the "woods" set, but this is less ideal when you want the option of using plastic and wood feet while using only wood hands, as this will filter out all plastic holds in general, even if they are just feet.

This might be an easier feature to implement after #12 is implemented.