Display help command summary in help modal

[HemanshuGandhi]

• Refactors the original code in BlockContentEditView; creates a ViewOnlyModal class that contains most of the logic for modals, then makes BlockContentEditView extend this class.
• Standardises some Coding conventions in fxml and view files.
• Uses assertions and logging.
• Updates the Help Modal to also display a short command summary.

Ready for review.

[netlify[bot]]

Deploy preview for notably-app ready!

Built with commit e50922b186d7eb5fff6c10531be6434c59f824e4

https://deploy-preview-481--notably-app.netlify.com

[codecov[bot]]

Codecov Report

Merging #481 into master will decrease coverage by 0.90%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #481      +/-   ##
============================================
- Coverage     68.19%   67.29%   -0.91%     
  Complexity      615      615              
============================================
  Files           104      106       +2     
  Lines          2462     2495      +33     
  Branches        232      232              
============================================
  Hits           1679     1679              
- Misses          706      739      +33     
  Partials         77       77              

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/com/notably/MainApp.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/com/notably/commons/Help.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
src/main/java/com/notably/view/CommandBox.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/com/notably/view/HelpWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/com/notably/view/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/com/notably/view/ViewManager.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/com/notably/view/ViewOnlyModal.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
src/main/java/com/notably/view/ViewPart.java	84.00% <ø> (ø)	4.00 <0.00> (ø)
...bly/view/blockcontent/BlockContentDisplayView.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...otably/view/blockcontent/BlockContentEditView.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
... and 5 more

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