Related displays without files

[adedamola-sode]

Changes include:

1. Modifying models to hold either a file, or a remote_screen
2. Changing the allocate widget function in generate.py to try for a file first, if not, select the remote_screen key instead as it is either one or the other
3. Passing the IOC macro to all generated action buttons

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.31%. Comparing base (2f86a73) to head (2b1add1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
+ Coverage   94.77%   95.31%   +0.54%     
==========================================
  Files          10       10              
  Lines         861      854       -7     
==========================================
- Hits          816      814       -2     
+ Misses         45       40       -5     

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[adedamola-sode]

This should have been a separate commit, but the testing was done together:

1. Added an if branch for embedded screens in json map, to add the children of the embedded screen to the current node skipping the embedded screen itself
2. Modified the tests for json_map_embedded_screens