Make settings menus external -21.7kb DFU

applications/services/expansion/application.fam

@@ -5,6 +5,8 @@ App(
     cdefines=["SRV_EXPANSION"],
     sdk_headers=[
         "expansion.h",
+        "expansion_i.h",
+        "expansion_settings.h",
     ],
     requires=["rpc_start"],
     provides=["expansion_settings"],

applications/services/expansion/expansion_i.h

@@ -3,4 +3,12 @@
 #include "expansion_settings.h"
 #include "expansion.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 ExpansionSettings* expansion_get_settings(Expansion* instance);
+
+#ifdef __cplusplus
+}
+#endif