Added # to versionstring and strip comments

Prepended the version string with a # to avoid the CLI from interpreting
the version string as a command when pasting a dump file back (restore
in CLI).

Strip comments starting with `# comment` from lines. This is to allow
adding comments to CLI dumped backup files. For this i have an automated
addition of comments and/or manual comments by the user in mind.

src/main/io/serial_cli.c

@@ -1644,7 +1644,7 @@ static void cliVersion(char *cmdline)
 {
     UNUSED(cmdline);
 
-    printf("Cleanflight/%s %s %s / %s (%s)",
+    printf("# Cleanflight/%s %s %s / %s (%s)",
         targetName,
         FC_VERSION_STRING,
         buildDate,
@@ -1710,6 +1710,13 @@ void cliProcess(void)
             clicmd_t target;
             cliPrint("\r\n");
 
+            // Strip comment starting with # from line
+            char *p = cliBuffer;
+            p = strchr(++p, '#');
+            if (NULL != p) {
+                bufferIndex = (uint32_t)(p - cliBuffer);
+            }
+
             // Strip trailing whitespace
             while (bufferIndex > 0 && cliBuffer[bufferIndex - 1] == ' ') {
                 bufferIndex--;