Channel check is very slow
The channel check when ndscope is loaded is very slow: a second or two per channel. When a template with dozens of channels is loaded, ndscope takes too long to start.
Right now ndscope is using find_channels() once for each channel
we have some options:
- does nds1 allow searches for multiple channels in a single commande?
- run search in the background
- Run multiple searches at once
- Only search if there's a missing channel when trying to run
If we can't do any of those, we should at least have a command line option/template option to skip the search.