Rework storage API

[alexjbush]

Description

This PR makes several breaking changes to improve storage actions. Audit tables are now entities on the flow, and all audit table reading happens in actions on the flow.

Fixes #51

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [X] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Unit tests

[alexjbush]

Working on scaladocs

[coveralls]

Pull Request Test Coverage Report for Build 421

• 52 of 53 (98.11%) changed or added relevant lines in 2 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.4%) to 79.446%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
waimak-storage/src/main/scala/com/coxautodata/waimak/storage/StorageActions.scala	30	31	96.77%
<!--	Total:	52	53	98.11%	-->

Files with Coverage Reduction	New Missed Lines	%
waimak-storage/src/main/scala/com/coxautodata/waimak/storage/FileStorageOps.scala	1	92.31%
waimak-storage/src/main/scala/com/coxautodata/waimak/storage/AuditTableFile.scala	1	95.98%
<!--	Total:	2		-->

Totals
Change from base Build 411:	0.4%
Covered Lines:	1148
Relevant Lines:	1445

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💛 - Coveralls