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

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.56%. Comparing base (2f86a73) to head (23eff1a).

Files with missing lines	Patch %	Lines
src/techui_builder/generate.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
- Coverage   94.77%   94.56%   -0.21%     
==========================================
  Files          10       10              
  Lines         861      865       +4     
==========================================
+ Hits          816      818       +2     
- Misses         45       47       +2     

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