NFC Unit tests part 1.1 (#1927)

* Mifare Classic 1/4K, 4/7b uid, NFC-A: NFC-A is not complete yet, as there are no 4b uid tests. Also, Mifare Classic tests don't cover the key cache yet.
* NFC unit tests require access to the NFC app
* Made nfc_device_save accept full path as an argument
* Move from cstrs to furi strings and fix logic
* nfc tests: fix memory leak
* nfc: add mf_classic_get_total_blocks() to API
* nfc tests: simplify nfc tests
* nfc: fix memory leak in shadow file saving
* nfc: fix set uid scene
* nfc: fix saving files
* nfc: fix preload nfc file path
* nfc: remove comments

Co-authored-by: Sergey Gavrilov <who.just.the.doctor@gmail.com>
Co-authored-by: gornekich <n.gorbadey@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

applications/main/nfc/scenes/nfc_scene_file_select.c

@@ -5,6 +5,9 @@ void nfc_scene_file_select_on_enter(void* context) {
     Nfc* nfc = context;
     // Process file_select return
     nfc_device_set_loading_callback(nfc->dev, nfc_show_loading_popup, nfc);
+    if(!furi_string_size(nfc->dev->load_path)) {
+        furi_string_set_str(nfc->dev->load_path, NFC_APP_FOLDER);
+    }
     if(nfc_file_select(nfc->dev)) {
         scene_manager_set_scene_state(nfc->scene_manager, NfcSceneSavedMenu, 0);
         scene_manager_next_scene(nfc->scene_manager, NfcSceneSavedMenu);