SimRadio: clean-up and emulate collisions (#5487)

* Clean up SimRadio and don't let it use PKC

* Add collision emulation for SimRadio

* Add stats from SimRadio to LocalStats

* Make emulating collisions optional

src/mesh/MeshService.h

@@ -10,7 +10,7 @@
 #include "MeshTypes.h"
 #include "Observer.h"
 #include "PointerQueue.h"
-#if defined(ARCH_PORTDUINO) && !HAS_RADIO
+#if defined(ARCH_PORTDUINO)
 #include "../platform/portduino/SimRadio.h"
 #endif
 #if defined(ARCH_ESP32) || defined(ARCH_PORTDUINO)
@@ -165,4 +165,4 @@ class MeshService
     friend class RoutingModule;
 };
 
-extern MeshService *service;
+extern MeshService *service;