Add transaction merging (#544)

[VMelnalksnis]

Fixes #544

Changes proposed in this pull request:

• Add transaction merging
• Remove redundant code from counterparty merging

[codecov]

Codecov Report

Merging #546 (4088d8b) into master (5af4207) will decrease coverage by 0.02%.
The diff coverage is 66.03%.

@@            Coverage Diff             @@
##           master     #546      +/-   ##
==========================================
- Coverage   67.96%   67.94%   -0.03%     
==========================================
  Files         302      303       +1     
  Lines        8991     9040      +49     
  Branches      655      658       +3     
==========================================
+ Hits         6111     6142      +31     
- Misses       2637     2655      +18     
  Partials      243      243              

Impacted Files	Coverage Δ
...onia.Core/DesignTime/DesignTimeGnomeshadeClient.cs	72.75% <0.00%> (-0.24%)	⬇️
...nia.Core/Transactions/Controls/TransactionMerge.cs	25.00% <25.00%> (ø)
...Avalonia.Core/Transactions/TransactionViewModel.cs	63.11% <33.33%> (-3.25%)	⬇️
...eshade.Data/Repositories/CounterpartyRepository.cs	100.00% <100.00%> (+9.09%)	⬆️
source/Gnomeshade.Data/Repositories/Queries.cs	95.23% <100.00%> (+0.07%)	⬆️
...meshade.Data/Repositories/TransactionRepository.cs	100.00% <100.00%> (ø)
...ource/Gnomeshade.WebApi.Client/GnomeshadeClient.cs	79.85% <100.00%> (+0.30%)	⬆️
source/Gnomeshade.WebApi.Client/Routes.cs	95.23% <100.00%> (+0.11%)	⬆️
...de.WebApi/V1/Controllers/TransactionsController.cs	90.32% <100.00%> (+0.40%)	⬆️
...estingHelpers/Models/GnomeshadeClientExtensions.cs	100.00% <100.00%> (ø)
... and 2 more

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