[FL-1064] iButton CLI commands (#407)

* ibutton: add cli commands
* ibutton/scene: add cli event send
* ibutton: make separate scenes for cli commands
* ibutton/scene: add timeout to cli scenes
* ibutton: fix reading key data from cli
* cli: add cli_delete_command to API
* ibutton: delete cli command after app exit
* cli: free allocated string

Co-authored-by: あく <alleteam@gmail.com>

applications/ibutton/scene/ibutton-scene-cli-read.h

@@ -0,0 +1,12 @@
+#pragma once
+#include "ibutton-scene-generic.h"
+
+class iButtonSceneCliRead : public iButtonScene {
+public:
+    void on_enter(iButtonApp* app) final;
+    bool on_event(iButtonApp* app, iButtonEvent* event) final;
+    void on_exit(iButtonApp* app) final;
+
+private:
+    uint16_t timeout;
+};