Furi: smaller crash routine (#1912)

* Furi: smaller crash routine
* Furi: small fixes
* Furi: cleanup check routines, more assembly code, force inline of __furi_halt_mcu
* SubGhz: cleanup residual line mess
* Documentation
* Dap-link: fix help
* Furi: replace __furi_halt_mcu with HALT_MCU macros
* Furi: disable IRQ earlier in crash handler
* Furi: properly handle masked mode when detecting ISR
* Ble: allow 0 length feed in rpc_session_feed
* Format sources
* Furi: better crash logic explanation.
* Furi: some grammar in check.h

Co-authored-by: SG <who.just.the.doctor@gmail.com>

applications/services/rpc/rpc.c

@@ -148,7 +148,8 @@ size_t
     rpc_session_feed(RpcSession* session, uint8_t* encoded_bytes, size_t size, TickType_t timeout) {
     furi_assert(session);
     furi_assert(encoded_bytes);
-    furi_assert(size > 0);
+
+    if(!size) return 0;
 
     size_t bytes_sent = furi_stream_buffer_send(session->stream, encoded_bytes, size, timeout);