* golangci-lint: Enable usetesting and unused linters
* tests: Improve assertions in various test cases for clarity and accuracy
* tests: Enhance error assertions in TestExecuteStrategyFromFile for improved clarity
* tests: Update assertions for improved clarity and accuracy
* tests: Replace assert with require for task count checks
* config/versions/v7: Replace context.Background() with t.Context()
* Bithumb: Centralise and consoliate testPair, relax UpdateTickers check
with some glorious Doom Eternal music
* Bithumb: Use UpdatePairsOnce and update remaining pair string
* Bithumb: Add UpdatePairsOnce to TestUpdateTickers
* Config: Move config versions to separate pacakges
* Config: Move version tests to blackbox texts
* Config: Protect registerVersion from overflow
* Config: Protect against version already registered
* Config: Replace consts for Version2 from/to
Could have moved them to v2/consts.go but doesn't seem enough RoI
* Config: Use generic error in Version4
* Config: Fix Version5 pkg vars
* Config: Fix Version6 test func names and shared test var
