add moving animation support, fix debug printing

util/generics.go

@@ -1,7 +1,10 @@
 package util
 
 import (
+	"context"
 	. "openquell/config"
+
+	"log/slog"
 )
 
 // find an item in a list, generic variant
@@ -41,3 +44,7 @@ func DirectionStr(dir int) string {
 
 	return str
 }
+
+func DebugEnabled() bool {
+	return slog.Default().Enabled(context.TODO(), slog.LevelDebug)
+}