Make printf great again (#1438)

* Printf lib: wrap *printf* functions
* Printf lib, FW: drop sprintf. Dolphin: dump timestamp as is, wo asctime.
* FW: remove sniprintf, wrap assert functions
* Printf lib: wrap putc, puts, putchar
* Printf: a working but not thread-safe concept.
* Poorly wrap fflush
* stdglue: buffers
* Core: thread local buffers
* Core: move stdglue to thread api, add ability to get FuriThread instance of current thread.
* RPC tests: replace sprintf with snprintf
* Applications: use new stdout api
* Printf lib: wrap more printf-like and stdout functions
* Documentation
* Apps: snprintf size fixes

Co-authored-by: あく <alleteam@gmail.com>

applications/rpc/rpc_storage.c

@@ -541,7 +541,7 @@ static void rpc_system_storage_md5sum_process(const PB_Main* request, void* cont
         (void)md5sum_size;
         furi_assert(hash_size <= ((md5sum_size - 1) / 2));
         for(uint8_t i = 0; i < hash_size; i++) {
-            md5sum += sprintf(md5sum, "%02x", hash[i]);
+            md5sum += snprintf(md5sum, md5sum_size, "%02x", hash[i]);
         }
 
         free(hash);