Unification branch

[marcobonici]

The goal of this PR is to finally merge into develop the new unification approach.

This will enable us to use more EFT code simoultaneously, without breaking the code.
Also, check the AP before merging.

[codecov]

Codecov Report

Attention: Patch coverage is 40.18692% with 64 lines in your changes missing coverage. Please review.

Project coverage is 40.55%. Comparing base (6c54d31) to head (56be36c).
Report is 27 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/utils.jl	6.89%	27 Missing ⚠️
src/background.jl	68.51%	17 Missing ⚠️
src/eft_commands.jl	0.00%	13 Missing ⚠️
src/neural_networks.jl	0.00%	6 Missing ⚠️
src/projection.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop      #37       +/-   ##
============================================
- Coverage    57.39%   40.55%   -16.85%     
============================================
  Files            7        7               
  Lines          514      508        -6     
============================================
- Hits           295      206       -89     
- Misses         219      302       +83     

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