allow multiple view plugins for the same neurodata type

[magland]

This addresses #75

It is now possible to register multiple view plugins for the same neurodata type, with one of them being explicitly tagged as the default view. Then it appears like this:

So the user can select multiple views to see them in the same tab, or open just the default view, or just an optional view. There's a lot more flexibility this way.

Here's the relevant section of the code for registering the default and optional view plugins:

neurosift/gui/src/pages/NwbPage/viewPlugins/viewPlugins.ts

Lines 35 to 150 in d58436d

	///////////////////////////////////////////////////////////////////////////////////////
	// REGISTER VIEW PLUGINS HERE
	// ImageSegmentation
	viewPlugins.push({
	name: 'ImageSegmentation',
	neurodataType: 'ImageSegmentation',
	defaultForNeurodataType: true,
	component: ImageSegmentationItemView
	})
	// SpatialSeries
	viewPlugins.push({
	name: 'SpatialSeries',
	neurodataType: 'SpatialSeries',
	defaultForNeurodataType: true,
	component: NeurodataSpatialSeriesItemView
	})
	viewPlugins.push({
	name: 'X/Y',
	neurodataType: 'SpatialSeries',
	defaultForNeurodataType: false,
	component: SpatialSeriesXYView,
	buttonLabel: 'X/Y'
	})
	// TwoPhotonSeries
	viewPlugins.push({
	name: 'TwoPhotonSeries',
	neurodataType: 'TwoPhotonSeries',
	defaultForNeurodataType: true,
	component: TwoPhotonSeriesItemView
	})
	// TimeSeries
	viewPlugins.push({
	name: 'TimeSeries',
	neurodataType: 'TimeSeries',
	defaultForNeurodataType: true,
	component: NeurodataTimeSeriesItemView
	})
	// DynamicTable
	viewPlugins.push({
	name: 'DynamicTable',
	neurodataType: 'DynamicTable',
	defaultForNeurodataType: true,
	component: DynamicTableView
	})
	// TimeIntervals
	viewPlugins.push({
	name: 'TimeIntervals',
	neurodataType: 'TimeIntervals',
	defaultForNeurodataType: true,
	component: NeurodataTimeIntervalsItemView
	})
	// ElectricalSeries
	viewPlugins.push({
	name: 'ElectricalSeries',
	neurodataType: 'ElectricalSeries',
	defaultForNeurodataType: true,
	component: NeurodataElectricalSeriesItemView
	})
	// HelloWorld
	viewPlugins.push({
	name: 'HelloWorld',
	neurodataType: 'LabeledEvents', // hi-jacking this type for now
	defaultForNeurodataType: true,
	component: HelloWorldView // see ./HelloWorld/HelloWorldView.tsx
	})
	// See https://flatironinstitute.github.io/neurosift/#/nwb?url=https://dandiarchive.s3.amazonaws.com/blobs/8cf/38e/8cf38e36-6cd8-4c10-9d74-c2e6be70f019
	// for an example that has a LabeledEvents object inside processing/behavior
	// ImageSeries
	viewPlugins.push({
	name: 'ImageSeries',
	neurodataType: 'ImageSeries',
	defaultForNeurodataType: true,
	component: ImageSeriesItemView
	})
	// Units
	viewPlugins.push({
	name: 'DirectRasterPlot',
	neurodataType: 'Units',
	defaultForNeurodataType: false,
	buttonLabel: 'raster plot',
	component: DirectRasterPlotUnitsItemView
	})
	viewPlugins.push({
	name: 'RasterPlot',
	neurodataType: 'Units',
	defaultForNeurodataType: false,
	buttonLabel: 'precomputed raster plot',
	component: RasterPlotUnitsItemView
	})
	viewPlugins.push({
	name: 'Autocorrelograms',
	neurodataType: 'Units',
	defaultForNeurodataType: false,
	buttonLabel: 'autocorrelograms',
	component: AutocorrelogramsUnitsItemView
	})
	// Images
	viewPlugins.push({
	name: 'Images',
	neurodataType: 'Images',
	defaultForNeurodataType: true,
	component: ImagesItemView
	})
	///////////////////////////////////////////////////////////////////////////////////////