Minor CLI update to give a noreboot option so save and exit (#13904)

* Give a -n option to exit CLI

- means you can set any serial port to MSP, and then activate CLI on it using #, with an "exit -n" to return to MSP mode without a reboot required.
- https://webserial.io is a great utility for using CLI outside the configurator.
- future changes will include possible multiple CLIs being active at the same time, along with debug printf from anywhere in the code to an active debug cli.

* Altered to strcasecmp, and changed param required to noreboot

* Adding additional details to the commands

src/main/cli/cli.c

@@ -3594,6 +3594,9 @@ static void cliExit(const char *cmdName, char *cmdline)
     cliMode = false;
     // incase a motor was left running during motortest, clear it here
     mixerResetDisarmedMotors();
+    if (strcasecmp(cmdline, "noreboot") == 0) {
+        return;
+    }
     cliReboot();
 }
 
@@ -4250,6 +4253,9 @@ static void cliSave(const char *cmdName, char *cmdline)
         writeEEPROM();
         cliPrintHashLine("saving");
 
+        if (strcasecmp(cmdline, "noreboot") == 0) {
+            return;
+        }
         cliReboot();
     }
 }
@@ -6512,7 +6518,7 @@ const clicmd_t cmdTable[] = {
 #ifdef USE_ESCSERIAL
     CLI_COMMAND_DEF("escprog", "passthrough esc to serial", "<mode [sk/bl/ki/cc]> <index>", cliEscPassthrough),
 #endif
-    CLI_COMMAND_DEF("exit", NULL, NULL, cliExit),
+    CLI_COMMAND_DEF("exit", "exit command line interface and reboot (default)", "[noreboot]", cliExit),
     CLI_COMMAND_DEF("feature", "configure features",
         "list\r\n"
         "\t<->[name]", cliFeature),
@@ -6571,7 +6577,7 @@ const clicmd_t cmdTable[] = {
 #endif
     CLI_COMMAND_DEF("rxfail", "show/set rx failsafe settings", NULL, cliRxFailsafe),
     CLI_COMMAND_DEF("rxrange", "configure rx channel ranges", NULL, cliRxRange),
-    CLI_COMMAND_DEF("save", "save and reboot", NULL, cliSave),
+    CLI_COMMAND_DEF("save", "save and reboot (default)", "[noreboot]", cliSave),
 #ifdef USE_SDCARD
     CLI_COMMAND_DEF("sd_info", "sdcard info", NULL, cliSdInfo),
 #endif
@@ -6768,7 +6774,7 @@ static void processCharacterInteractive(const char c)
 
 void cliProcess(void)
 {
-    if (!cliWriter) {
+    if (!cliWriter || !cliMode) {
         return;
     }