Switched to only using HomeAndSettings NBGL use case

Also merged idle and settings source files

src/common_ui.h

@@ -13,7 +13,6 @@ void ui_display_public_key(const uint64_t *chain_id);
 void ui_sign_712_v0(void);
 void ui_confirm_selector(void);
 void ui_confirm_parameter(void);
-void app_quit(void);
 
 // EIP-191
 void ui_191_start(void);