adds scattering perturbations feature, lunar projections (LTM/LPS) & Moon example

[danielpeter]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 19.54023% with 700 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.26%. Comparing base (8bd3f5a) to head (332ce8b).
⚠️ Report is 12 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/generate_databases/model_scattering.f90	0.00%	380 Missing ⚠️
src/shared/utm_geo.f90	1.03%	96 Missing ⚠️
src/shared/fft.f90	50.00%	59 Missing ⚠️
src/specfem3D/locate_source.F90	24.00%	38 Missing ⚠️
src/meshfem3D/read_mesh_parameter_file.f90	30.76%	27 Missing ⚠️
src/specfem3D/couple_with_injection.f90	0.00%	23 Missing ⚠️
src/shared/read_parameter_file.F90	35.71%	18 Missing ⚠️
src/meshfem3D/meshfem3D.F90	50.00%	16 Missing ⚠️
src/specfem3D/locate_receivers.f90	71.42%	10 Missing ⚠️
src/generate_databases/read_parameters.f90	45.45%	6 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1848      +/-   ##
==========================================
- Coverage   48.72%   48.26%   -0.46%     
==========================================
  Files         273      275       +2     
  Lines       65052    65748     +696     
==========================================
+ Hits        31696    31736      +40     
- Misses      33356    34012     +656     

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