Linfeng - Second PR of c++ thermo using pybind11

[gitlinffff]

cape_cin, lfc, el, parcel_profile remain in Python but utilize other underlying c++ functions.

c++ functions created at this stage:

• MoistAirGasConstant
• MoistAirSpecificHeatPressure
• WaterLatentHeatVaporization
• WaterLatentHeatSublimation
• RelativeHumidityFromDewPoint
• DryLapse (using py::vectorize)
• DryLapseProfile
• CaldlnTdlnP
• MoistLapse
• MoistLapseProfile
• LCL
• LCLVectorized
• _CheckPressure
• ParcelProfile
• _ParcelProfileHelper
• _SaturationVaporPressureLiquid
• _SaturationVaporPressureSolid
• SaturationVaporPressure
• DewPoint
• MixingRatio
• SaturationMixingRatio
• SpecificHumidityFromMixingRatio
• SpecificHumidityFromDewPoint
• VirtualTemperature
• VirtualTemperatureFromDewpoint
• lambert_wm1

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:white_check_mark: dopplershift
:x: Linfeng Li

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