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.

firmware/targets/f7/furi-hal/furi-hal.c

@@ -17,6 +17,9 @@ void furi_hal_init() {
     furi_hal_interrupt_init();
     furi_hal_delay_init();
 
+    // FreeRTOS glue
+    furi_hal_os_init();
+
     MX_GPIO_Init();
     FURI_LOG_I(TAG, "GPIO OK");
 
@@ -56,9 +59,6 @@ void furi_hal_init() {
     furi_hal_bt_init();
     furi_hal_compress_icon_init();
 
-    // FreeRTOS glue
-    furi_hal_os_init();
-
     // FatFS driver initialization
     MX_FATFS_Init();
     FURI_LOG_I(TAG, "FATFS OK");