CI: Fix golangci-lint linter issues, add prealloc linter and bump version depends for Go 1.18 (#915)

* Bump CI versions

* Specifically set go version as 1.17.x bumps it to 1.18

* Another

* Adjust AppVeyor

* Part 1 of linter issues

* Part 2

* Fix various linters and improvements

* Part 3

* Finishing touches

* Tests and EqualFold

* Fix nitterinos plus bonus requester jobs bump for exchanges with large number of tests

* Fix nitterinos and bump golangci-lint timeout for AppVeyor

* Address nits, ensure all books are returned on err due to syncer regression

* Fix the wiggins

* Fix duplication

* Fix nitterinos

currency/code_test.go

@@ -354,7 +354,11 @@ func TestBaseCode(t *testing.T) {
 			len(full.UnsetCurrency))
 	}
 
-	if full.LastMainUpdate.(int64) != -62135596800 {
+	lastMainUpdate, ok := full.LastMainUpdate.(int64)
+	if !ok {
+		t.Error("unable to type assert LastMainUpdate")
+	}
+	if lastMainUpdate != -62135596800 {
 		t.Errorf("BaseCode GetFullCurrencyData() error expected -62135596800 but received %d",
 			full.LastMainUpdate)
 	}