Updating niscope enums (#620)

* adding some of missing enums for niscope
* Attaching enums to methods
* updating generated niscope files
* fixed review comments
* updating generated files for niscope
* fixed niscope systemtests to have proper enums
* adding enum for sendSoftwareTriggerEdge
* updating generated for niscope
* added comment back on functions_addon.py to update enums
* updating inputImpedance enum to have proper value
* Updating generated for niscope
* updating enums_addon.py to have niscope enums
* adding new enums to enums_addon.py
* updpating AcquisitionStatus to have proper values
* updating generated for niscope
* updating niscope system test to check acquisition_status retunrs enum
* Adding attribute tests for niscope
* Fixing Flake8 Failure
* Updating channel enums to be strings. Updating names of channel enums to be consistent with C 
 enums. Adding all enums for trigger source in .h file.
* Adding missed enums on functions_addon.py
* Removed redundant enum form functions_addon for niscope
* updating enums_addon for niscope to have names starts with NISCOPE_VAL_
* updating generated for niscope
* Removing TriggerSource, TriggerSourceDigital, and ExportDestinations enums that are strings
* Adding .eggs to exlude line
* Making system tests use defaults
* Fixing space

NI-SCOPE review notes.md

@@ -2,24 +2,6 @@
 
 Everything listed here still needs to be implemented.
 
-##Enums
-
-* add_waveform_processing should have enum
-* cal_self_calibrate needs enum
-* clear_waveform_measurement_stats needs enum
-* configure_vertical coupling is enum
-* fetch_measurement scalar_meas_function
-* fetch_measurement_stats scalar_meas_function
-* read_measurement scalar_meas_function
-* acquisition_status return enum
-* configure_trigger_digital slope
-* configure_trigger_edge slope, trigger_coupling
-* configure_trigger_hysteresis(self, trigger_source, level, hysteresis, slope, trigger_coupling, holdoff, delay):
-* configure_trigger_video signal_format, event, polarity, trigger_coupling
-* configure_trigger_window window_mode, trigger_coupling
-* export_signal signal
-* send_software_trigger_edge which_trigger
-
 ##Other notes
 
 * The following still need review. PR to support them has been merged.