Hackathone session: bugfixes and documentation update (#869)

* ReadMe: update flashing scripts section
* Furi: add record exists method to record store.
* FuriHal: early OS init and i2c timeouts based on os ticks.
* Storage: replace malloc with furi_alloc, fix errors found by pvs.
* iButton: properly handle shutdown in cli search command
* SubGhz: proper argument type in sscanf and incorrect position of logging in switch.

applications/subghz/subghz_i.c

@@ -41,8 +41,8 @@ bool subghz_get_preset_name(SubGhz* subghz, string_t preset) {
     case FuriHalSubGhzPreset2FSKDev476Async:
         preset_name = "FuriHalSubGhzPreset2FSKDev476Async";
         break;
-        FURI_LOG_E(SUBGHZ_PARSER_TAG, "Unknown preset");
     default:
+        FURI_LOG_E(SUBGHZ_PARSER_TAG, "Unknown preset");
         return false;
         break;
     }