[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 26.47059% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.57%. Comparing base (eb17361) to head (b3b849e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1305      +/-   ##
==========================================
- Coverage   72.73%   72.57%   -0.16%     
==========================================
  Files         295      295              
  Lines       25445    25509      +64     
  Branches     3565     3575      +10     
==========================================
+ Hits        18507    18514       +7     
- Misses       5436     5485      +49     
- Partials     1502     1510       +8     

Flag	Coverage Δ
smoketests	69.58% <26.47%> (-0.14%)	⬇️
unittests	13.79% <0.00%> (-0.04%)	⬇️

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Components	Coverage Δ
Scripts	75.34% <27.27%> (-0.04%)	⬇️
Library	69.28% <26.31%> (-0.28%)	⬇️

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