Consolidate receipt_overlay and loading_overlay

[fremartini]

closes #386

[ghost]

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[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (ad17be8) 74.22% compared to head (f73d070) 73.93%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #511      +/-   ##
===========================================
- Coverage    74.22%   73.93%   -0.30%     
===========================================
  Files          127      128       +1     
  Lines         1521     1527       +6     
===========================================
  Hits          1129     1129              
- Misses         392      398       +6     

Flag	Coverage Δ
unittests	73.93% <0.00%> (-0.30%)	⬇️

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Files	Coverage Δ
...core/network/network_request_executor_mapping.dart	100.00% <ø> (ø)
lib/core/strings.dart	30.95% <0.00%> (-1.55%)	⬇️
lib/core/external/screen_brightness.dart	0.00% <0.00%> (ø)

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[marfavi]

1 change otherwise OK