Multiple allowed formats

[tumb1er]

RM: #21026

Add formats bit field to allow multiple formats for same asset type

[codecov]

Codecov Report

Merging #34 into master will increase coverage by 0.38%.
The diff coverage is 97.19%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   97.46%   97.85%   +0.38%     
==========================================
  Files          20       24       +4     
  Lines         592      652      +60     
==========================================
+ Hits          577      638      +61     
+ Misses         15       14       -1     

Flag	Coverage Δ
#unittests	97.85% <97.19%> (+0.38%)	⬆️

Impacted Files	Coverage Δ
image_assets/migrations/0001_initial.py	100.00% <ø> (ø)
...mage_assets/migrations/0002_models_localization.py	100.00% <ø> (ø)
image_assets/migrations/0006_migrate_formats.py	75.00% <75.00%> (ø)
image_assets/admin.py	100.00% <100.00%> (ø)
image_assets/migrations/0005_assettype_formats.py	100.00% <100.00%> (ø)
image_assets/migrations/0007_auto_20200406_1313.py	100.00% <100.00%> (ø)
image_assets/models.py	100.00% <100.00%> (+2.87%)	⬆️
image_assets/validators.py	100.00% <100.00%> (ø)
testproject/testapp/tests.py	99.52% <100.00%> (+0.02%)	⬆️
... and 4 more

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