Update directory structure

[fremartini]

closes #490

[ghost]

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -10.06% ⚠️

Comparison is base (1fd284e) 84.27% compared to head (3b9cfcd) 74.22%.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #509       +/-   ##
============================================
- Coverage    84.27%   74.22%   -10.06%     
============================================
  Files          116      127       +11     
  Lines         1164     1521      +357     
============================================
+ Hits           981     1129      +148     
- Misses         183      392      +209     

Flag	Coverage Δ
unittests	74.22% <ø> (-10.06%)	⬇️

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Files Changed	Coverage Δ
lib/core/api_uri_constants.dart	0.00% <ø> (ø)
lib/core/encode_passcode.dart	100.00% <ø> (ø)
lib/core/errors/failures.dart	68.75% <ø> (ø)
lib/core/external/external_url_launcher.dart	0.00% <ø> (ø)
lib/core/firebase_analytics_event_logging.dart	100.00% <ø> (ø)
lib/core/ignore_value.dart	0.00% <ø> (ø)
lib/core/network/network_request_executor.dart	100.00% <ø> (ø)
lib/core/storage/secure_storage.dart	100.00% <ø> (ø)
lib/core/strings.dart	32.50% <ø> (ø)
lib/core/styles/app_colors.dart	0.00% <ø> (ø)
... and 32 more

... and 1 file with indirect coverage changes

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