[FIX] remove AnalogSignalGap

[KristijanArmeni]

Reference issue

Fixes #12413.

What does this implement/fix

So far, to insert gap data (0's representing missing samples), the AnalogSignalGap class with a dummy load() method was defined and used to mirror the neo.AnalogSignalProxy object which loads recorded samples from disk.

As of v13, neo allows onlyAnalogSignal/AnalogSignalProxy types to be appended to Segment.analogsignals attribute. To fix this, we drop the over-engineered AnalogSignalGap class. Instead, we create zero-arrays directly with AnalogSignal and use a simple control statement to distinguish loading real data (via AnalogSignalProxy.load().magnitude) and padding 0's (via AnalogSignal.magnitude) when looping over segments and creating the output data array.

[larsoner]

Suggested change

	if type(signal) is not AnalogSignal # then it's AnalogSignalProxy
	if not isinstance(signal, AnalogSignal) # then it's AnalogSignalProxy

or better, actually check if it's AnalogSignalProxy rather than AnalogSignal?

[KristijanArmeni]

Yeah, was just editing this. Can also check for AnalogSignalProxy. Wasn't sure if it's worth doing an import for that (from neo.io.proxyobjects import AnalogSignalProxy).

Commit coming + sorting the neo import at the correct location.

[KristijanArmeni]

@larsoner See if it looks good? If yes, needs update from main and good on my end.

[larsoner]

Thanks for the quick fix @KristijanArmeni !