Add soft-delete

[VMelnalksnis]

Changes proposed in this pull request:

• Use containerized database for integration tests (Add Docker support #205)
• Move delete queries to procedures (Move finalized SQL queries to procedures #228)

[codecov]

Codecov Report

Merging #409 (b5a667d) into master (d5f6c6e) will decrease coverage by 0.72%.
The diff coverage is 87.05%.

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
- Coverage   65.60%   64.87%   -0.73%     
==========================================
  Files         261      249      -12     
  Lines        7064     6845     -219     
  Branches      529      526       -3     
==========================================
- Hits         4634     4441     -193     
+ Misses       2271     2250      -21     
+ Partials      159      154       -5     

Impacted Files	Coverage Δ
source/Gnomeshade.Data/Entities/AccessEntity.cs	100.00% <ø> (ø)
source/Gnomeshade.Data/Entities/AccountEntity.cs	100.00% <ø> (ø)
...nomeshade.Data/Entities/AccountInCurrencyEntity.cs	100.00% <ø> (ø)
source/Gnomeshade.Data/Entities/CategoryEntity.cs	100.00% <ø> (ø)
...rce/Gnomeshade.Data/Entities/CounterpartyEntity.cs	100.00% <ø> (ø)
source/Gnomeshade.Data/Entities/LinkEntity.cs	100.00% <ø> (ø)
source/Gnomeshade.Data/Entities/LoanEntity.cs	100.00% <ø> (ø)
source/Gnomeshade.Data/Entities/OwnershipEntity.cs	100.00% <ø> (ø)
source/Gnomeshade.Data/Entities/ProductEntity.cs	100.00% <ø> (ø)
source/Gnomeshade.Data/Entities/PurchaseEntity.cs	100.00% <ø> (ø)
... and 52 more

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