[FL-2491] File browser GUI module (#1237)

* File browser module and test app
* nfc: Add support for saved files in subdirectories
* nfc: Use helper function to get shadow path when loading data
* File browser dialog integration pt.1
* File browser dialog integration pt.2
* Gui,Dialogs: drop file select
* Correct use of dynamic string_t(string_ptr)

Co-authored-by: Yukai Li <yukaili.geek@gmail.com>
Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/dialogs/dialogs_module_file_browser.h

@@ -0,0 +1,12 @@
+#pragma once
+#include "dialogs_message.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool dialogs_app_process_module_file_browser(const DialogsAppMessageDataFileBrowser* data);
+
+#ifdef __cplusplus
+}
+#endif