Radiative Decay

[shaering]

Added radiative decay using escape coefficients support to reacting-Flow based on
de27f14
Requires inputs

[reactions/reaction<N>]
model = radiative_decay
radius = 1.0

with correct stoichiometry. Supported lumped emissions:

'Ar_p => Ar_r + hv'
'Ar_p => Ar_m + hv'
'Ar_r => Ar + hv'

Compatibility with NEC based on using flag

[plasma_models]
is_rad_decay_in_NEC = true

where flag with include or exclude energy loss in temperature equation to be consistent with NEC table, as requested by user. Note: currently only functional with flag

[plasma_models/transport_model]
argon_minimal/third_order_thermal_conductivity = false

(fix will be handled in a separate bug fix)