Add dead time to scaling factors

[mdoucet]

Most of the Liquids Reflectometer code is now in this repo, except for the scaling factor calculation.
This PR brings those Mantid algorithms back to this repo. It keeps them as Mantid algorithm because it provide a nice way to encapsulate the work.

The two algorithms that were added were modified to use the dead time correction. A small workflow function as added to help orchestrate the calculation with a simple call, which can be added to RefRed.

Tests were added to exercise the various options and increase coverage.

• Add SF algorithms
• Ensure all the dead time algorithm parameters are propagated
• Write a top level workflow that can easily be called by other applications to run SF calculations
• Write tests
• Modify autoreduction script to use new SF workflow

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.87879% with 68 lines in your changes are missing coverage. Please review.

Project coverage is 81.38%. Comparing base (32ef089) to head (62f2596).

Files	Patch %	Lines
...n/lr_reduction/scaling_factors/LRDirectBeamSort.py	78.04%	45 Missing ⚠️
...n/lr_reduction/scaling_factors/LRScalingFactors.py	91.76%	21 Missing ⚠️
reduction/test/test_scaling_factors.py	97.10%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   79.23%   81.38%   +2.14%     
==========================================
  Files          16       20       +4     
  Lines        1695     2256     +561     
==========================================
+ Hits         1343     1836     +493     
- Misses        352      420      +68     

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[jmborr]

very fancy 🌸