Added fap_version field to all apps (#15)

application.fam

@@ -6,6 +6,7 @@ App(
     requires=["gui"],
     stack_size=1 * 1024,
     fap_description="Control GPIO pins to generate digital signals",
+    fap_version="1.0",
     fap_icon="signal_gen_10px.png",
     fap_category="GPIO",
     fap_icon_assets="icons",