Logging redesign - part 4

[bcoconni]

Following PR #1147, this PR continues the migration to the new logging system.

After this PR will be merged, all the files in the folders src/models and src/models/flight_control should have been migrated to the new system.

Files in src/models/propulsion are not being migrated by this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 0.84034% with 472 lines in your changes missing coverage. Please review.

Project coverage is 24.74%. Comparing base (c587d54) to head (a9e425d).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/models/FGGasCell.cpp	0.00%	71 Missing ⚠️
src/models/FGLGear.cpp	0.00%	54 Missing ⚠️
src/models/flight_control/FGFCSComponent.cpp	0.00%	36 Missing ⚠️
src/models/flight_control/FGLinearActuator.cpp	0.00%	34 Missing ⚠️
src/models/flight_control/FGWaypoint.cpp	0.00%	32 Missing ⚠️
src/models/flight_control/FGSensor.cpp	0.00%	31 Missing ⚠️
src/models/flight_control/FGSwitch.cpp	0.00%	31 Missing ⚠️
src/models/flight_control/FGGain.cpp	0.00%	22 Missing ⚠️
src/models/FGOutput.cpp	0.00%	19 Missing ⚠️
src/models/flight_control/FGActuator.cpp	0.00%	13 Missing ⚠️
... and 17 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1176      +/-   ##
==========================================
- Coverage   24.96%   24.74%   -0.22%     
==========================================
  Files         170      170              
  Lines       19283    19459     +176     
==========================================
+ Hits         4814     4816       +2     
- Misses      14469    14643     +174     

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