cleaned up includes with iwyu
diff --git a/SignalsPanel.h b/SignalsPanel.h
index 0a90b08..0dfe24c 100644
--- a/SignalsPanel.h
+++ b/SignalsPanel.h
@@ -9,6 +9,7 @@
 
 #include "Panel.h"
 
+
 typedef struct SignalItem_ {
    const char* name;
    int number;