Adds livetime correction to get data

[jajmitchell]

Adds livetime correction to get data.

[samaloney]

Looks good - needs docs, change log and test/s

[samaloney]

So this is now in the instrument configuration namespace

stixpy/stixpy/config/instrument.py

Lines 78 to 92 in fb3004c

	STIX_INSTRUMENT = SimpleNamespace(
	__doc__="""This namespace contains the instrument name, visibility information, sub-collimator ADC mapping, sub-collimator parameters, and pixel configuration.
	The visibility information is obtained from the _get_uv_points_data function,
	the sub-collimator ADC mapping is read from the detector ADC mapping file,
	the sub-collimator parameters are read from the sub-collimator parameters file,
	and the pixel configuration is read from the pixel parameters file.
	The namespace is used to encapsulate all the configuration data related to the STIX instrument.
	This allows for easy access and management of the instrument's configuration data.""",
	name="STIX",
	vis_info=_get_uv_points_data(),
	subcol_adc_mapping=np.array(read_det_adc_mapping()["Adc #"]),
	subcol_params=_SUBCOL_PARAMS,
	pixel_config=read_pixel_params(),
	)

[samaloney]

Add properties for livetime and livefrac or deadfrac