Update filters.py (code for geomag-filter typer app):

- stop using factory.py; just instantiate factories in filters.py...it's only a little extra code, and a lot less confusing
- copy 1-second ObsRio float data (e.g., F, UK*) to RawInput so it is available using EdgeFactory, and also so we have the option in the future to prune 10Hz data from EdgeCWB that has already been archived at IRIS.
- set up calls to _copy_channel to legacy sncls to be removed once Edge data migration is complete
- make all *_filter methods require an instantiated io factory, and set no default options
- other than the *temporary* write ports for copies of legacy sncl data, allow no default ports in filters.py; either accept the factory defaults, or force user to specify ports with call to geomag-filter app.