Allow controllers to send multiple precursors

[joewandy]

It seems that in IAPI when sending a custom scan, we can specify multiple precursors and isolation windows, however our codes don't allow this at the moment.

[sdrogers]

Given that python is so wonderfully not type checked...we should be able to just add lists here: https://github.com/sdrogers/vimms/blob/bc128a805f8ef1ae934896c5ddedb454d8721e91/vimms/Environment.py#L225-L228 And then have some code in the MS class that checks if the values in those entries are values or lists?

Will require a change here too to cope with a list: https://github.com/sdrogers/vimms/blob/bc128a805f8ef1ae934896c5ddedb454d8721e91/vimms/MassSpec.py#L141-L152

Propose within the MS (i.e. lower done that method). I.e. controllers pass things as lists of precursors and widths. Within the MS simulator, we convert to windows (as we are doing now). I think this method is the only place where we should ever be using windows instead of (mz,width)

I'm not sure what changes will be required to work with the real MS. But I'm sure @joewandy will.

[sdrogers]

Also, this will need to change: https://github.com/sdrogers/vimms/blob/bc128a805f8ef1ae934896c5ddedb454d8721e91/vimms/MassSpec.py#L525-L528 To:

else:
  isolation_windows = params.compute_isolation_windows()

i.e. no need for if, because ScanParameters.ISOLATION_WINDOWS will never have anything in it (or, at least, shouldn't)