Generalize the call of the get_lcoe method inside calculate_off_grid_lcoes

[camiloramirezgo]

In the calculate_off_grid_lcoes method there is an explicit call for the get_lcoe method of each technology. There is a need of generalizing this call to make it easy to loop through any number of technologies.

[camiloramirezgo]

To do this we had to create a name property inside the Technology class which will replace the standard names of the technologies defined on the onsset.py file:

onsset/onsset/onsset.py

Lines 46 to 52 in bd634a2

	SET_LCOE_GRID = 'Grid' # All LCOE's in USD/kWh
	SET_LCOE_SA_PV = 'SA_PV'
	SET_LCOE_SA_DIESEL = 'SA_Diesel'
	SET_LCOE_MG_WIND = 'MG_Wind'
	SET_LCOE_MG_DIESEL = 'MG_Diesel'
	SET_LCOE_MG_PV = 'MG_PV'
	SET_LCOE_MG_HYDRO = 'MG_Hydro'

This name needs to be passed when creating the Technology, so it will need to be read from the configuration files. The names need still to be standard as these are the values used to create the dataframe columns.