Crosshair updates and more

[mpatrou]

Short description of the changes:

The code includes changes for the crosshair data plot update.
There is currently no plot in the view side (future story). The lines are updated in a sample plot, to demonstrate the updates occur

Long description of the changes:

The changes include:

• code cleanup and improvements to conform naming standards, e.g. snake case, for consistency
• tests new and updated for plot widget updates
• plot widget updates for eline and qline parameters
• plot parameters updates from view and presenter when data are valid

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • 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

Manual test for the reviewer

References

Display crosshair

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.90%. Comparing base (f3ccd22) to head (8a41058).

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #26      +/-   ##
==========================================
+ Coverage   92.30%   92.90%   +0.59%     
==========================================
  Files          10       10              
  Lines         715      747      +32     
==========================================
+ Hits          660      694      +34     
+ Misses         55       53       -2     

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[AndreiSavici]

Changes look good. Works as expected