Add search field and filters for crop list

[petteripitkanen]

Add search field and filters for crop list. Preferably make it work so that the user has to explicitly select which filters they want to use (maybe something like the trac ticket query interface?), instead of having all the filters editable on the view all the time.

This will be later used for the bed planner (#54) so make it reusable.

Also, this is related to #55 which is for redesigning the crop list and the search interface in antd.

[petteripitkanen]

Added the search field in #69. It is on the main thread currently but will probably be moved to the worker when full filtering is done.