(Experimental) External CLI plugins -29kb DFU

Idea and plugin loader implementation by @akopachov, thanks!
All commands done except storage and rpc for latency reasons

applications/main/ibutton/application.fam

@@ -11,11 +11,20 @@ App(
     fap_category="iButton",
 )
 
+App(
+    appid="ibutton_cli",
+    targets=["f7"],
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="ibutton_cli_plugin_ep",
+    requires=["cli"],
+    sources=["ibutton_cli.c"],
+)
+
 App(
     appid="ibutton_start",
     apptype=FlipperAppType.STARTUP,
     targets=["f7"],
     entry_point="ibutton_on_system_start",
-    sources=["ibutton_cli.c"],
+    sources=["ibutton_start.c"],
     order=60,
 )