Add UI element for Instrument Settings

[glass-ships]

Description of work:

Adds an InstrumentSettings model and UI interface for modifying intrument geometry parameters with which to run reduction.

Additionally adds deprecation warning for sf_calculator

Check all that apply:

• added release notes (if not, provide an explanation in the work description)
• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests
• Verified that tests requiring the /SNS and /HFIR filesystems pass without fail

References:

• Links to IBM EWM items: EWM Story 9080
• Links to related issues or pull requests: Allow custom instrument settings LiquidsReflectometer#61

Manual test for the reviewer

(instructions to set up the environment)

Clone the instrument-settings branch of lr_reduction:

git clone -b instrument-settings https://github.com/neutrons/LiquidsReflectometer.git

Activate your RefRed conda environment, replace the existing lr_reduction installation with the local version:

conda activate refred
pip uninstall lr_reduction -y

cd /path/to/LiquidsReflectometer

# make sure you're still in the refred conda env
pip install -e .

Start RefRed GUI

(refred)> PYTHONPATH=$(pwd):$PYTHONPATH ./scripts/start_refred.py

Then load test/data/test_instrument_settings.xml (make sure /SNS is mounted via fusermount) and attempt to run reduction,

Or run tests

(refred)> pytest test/unit/RefRed/test_main.py

Check list for the reviewer

• release notes updated, or an explanation is provided as to why release notes are unnecessary
• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.68217% with 55 lines in your changes missing coverage. Please review.

Project coverage is 63.78%. Comparing base (a04b724) to head (60f6f44).
Report is 2 commits behind head on next.

Files with missing lines	Patch %	Lines
RefRed/main.py	56.79%	35 Missing ⚠️
RefRed/interfaces/instrument_settings.py	82.27%	14 Missing ⚠️
RefRed/configuration/export_xml_config.py	97.01%	2 Missing ⚠️
RefRed/configuration/loading_configuration.py	50.00%	2 Missing ⚠️
RefRed/reduction/live_reduction_handler.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #141      +/-   ##
==========================================
+ Coverage   63.60%   63.78%   +0.17%     
==========================================
  Files         117      118       +1     
  Lines        9792     9882      +90     
==========================================
+ Hits         6228     6303      +75     
- Misses       3564     3579      +15     

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