Fix marker engine inflow

[BerkeCan97]

Proposed Changes

• Added the missing config->SetInflow_Mach(iMarker_Inlet, Inlet_Mach_Total[iMarker_Inlet]) to CEulerSolver::GetPower_Properties
• Added a new option,BC_EVAL_FREQ for setting the evaluation frequency for the Actuator Disk and Engine Markers, in order to control the stability of the marker.

Related Work

Fix for issue #2274 .

PR Checklist

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[BerkeCan97]

Hello

I am sorry if it is obvious but is there way to tell where the code style checks fails on the files? Looking at the the details section , only thing I can understand is that it failed to trim some trailing white spaces.

[pcarruscag]

If you install the precommit hook it will take care of formatting for you https://su2code.github.io/docs_v7/Style-Guide/