When talking via serial, encapsulate log messages in protobufs if necessary (#4187)

* clean up RedirectablePrint::log so it doesn't have three very different implementations inline.

* remove NoopPrint - it is no longer needed

* when talking to API clients via serial, don't turn off log msgs instead encapsuate them

* fix the build - would loop forever if there were no files to send

* don't use Segger code if not talking to a Segger debugger

* when encapsulating logs, make sure the strings always has nul terminators

* nrf52 soft device will watchdog if you use ICE while BT on...
so have debugger disable bluetooth.

* Important to not print debug messages while writing to the toPhone scratch buffer

* don't include newlines if encapsulating log records as protobufs

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/mesh/StreamAPI.h

@@ -82,4 +82,7 @@ class StreamAPI : public PhoneAPI
 
     /// Subclasses can use this scratch buffer if they wish
     uint8_t txBuf[MAX_STREAM_BUF_SIZE] = {0};
-};
+
+    /// Low level function to emit a protobuf encapsulated log record
+    void emitLogRecord(meshtastic_LogRecord_Level level, const char *src, const char *format, va_list arg);
+};