Rationale

There were previously only three "types" of transaction:

1. standard
2. cancel
3. retry

A fourth unintended case for type was undefined which was the case for incoming transactions

standard essentially means "not cancel or retry" and in any case where we look at standard what we actually care about is transactionCategory.

This pull request removes transactionCategory in favor of adding all of the 'categories' as additional types.

This should significantly cut down on some confusing thought cycles while having no impact on the extension. I might be missing some cases, though. Let me know what you think!

Details of Implementation

1. _determineTransactionCategory -> _determineTransactionType
2. transactionCategory: 'incoming' -> type: 'incoming'
3. transactionCategory -> type for all code touching the category
4. added typedefs for type and status
5. move TransactionMeta typedef to the transactions constant and use new typedefs in it
6. Migration for old state.

Prior work

this depends on #9459 and is based on it.