maps: expansion of Key concept (#1349)

* moves everything to use single map keys, also breaks

* full rollout

* tests

* fix a little bug

* minor test fixups

* Fix Key use

* rm 🔑 from 🔑 struct name

engine/engine_test.go

@@ -356,7 +356,7 @@ func TestSettingsPrint(t *testing.T) {
 
 var unsupportedDefaultConfigExchanges = []string{
 	"itbit",    // due to unsupported API
-	"poloniex", // outdated API // TODO remove once updated
+	"poloniex", // poloniex has dropped support for the API GCT has implemented //TODO: drop this when supported
 }
 
 func TestGetDefaultConfigurations(t *testing.T) {

engine/event_manager_test.go

@@ -299,7 +299,7 @@ func TestCheckEventCondition(t *testing.T) {
 	}
 	m.m.Lock()
 	err = m.checkEventCondition(&m.events[0])
-	if err != nil && !strings.Contains(err.Error(), "no tickers for") {
+	if err != nil && !strings.Contains(err.Error(), "no tickers associated") {
 		t.Error(err)
 	} else if err == nil {
 		t.Error("expected error")