[ENH] New RAP method to switch params

[arnaudbore]

Quick description

So far it can change params such as theta and step.

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Type of change

Check the relevant options.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Provide data, screenshots, command line to test (if relevant)

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Checklist

• My code follows the style guidelines of this project (run autopep8)
• I added relevant citations to scripts, modules and functions docstrings and descriptions
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I moved all functions from the script file (except the argparser and main) to scilpy modules
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

❌ Patch coverage is 33.56643% with 95 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.63%. Comparing base (b604b99) to head (ccc3643).
⚠️ Report is 31 commits behind head on master.

❌ Your patch status has failed because the patch coverage (33.56%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project status has failed because the head coverage (72.63%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1305      +/-   ##
==========================================
- Coverage   72.91%   72.63%   -0.29%     
==========================================
  Files         295      295              
  Lines       25453    25588     +135     
  Branches     3567     3597      +30     
==========================================
+ Hits        18560    18585      +25     
- Misses       5389     5489     +100     
- Partials     1504     1514      +10     

Flag	Coverage Δ
smoketests	69.48% <33.56%> (-0.28%)	⬇️
unittests	14.20% <0.00%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Scripts	75.26% <35.29%> (-0.18%)	⬇️
Library	69.49% <33.02%> (-0.42%)	⬇️

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[gabknight]

The logic and structure LGTM.

[gabknight]

Thanks @arnaudbore. LGTM.