Allow configuration of wifi credentials + hostname via settings.json

What it says on the tin.

• Replaces the hardcoded camp wifi credentials with ssid + psk read from settings.json. Also allows configuration of the badge network hostname.
• Adds barebones code for string type 'tunables'/settings. (Read only, can only be set via settings.json at the moment)
• Declaratively define hierarchical settings (sub-)menu structure
  • Only WiFi settings have their own submenu for now

Known issues: Display of string settings values in the settings screen is a bit glitchy. Not quite sure why, but I also haven't spent much time debugging it since this is just a barebones implementation for the functionality and the display issue is purely cosmetic and doesn't affect the core features of this patch.

components/bl00mbox/include/bl00mbox_audio.h

 //SPDX-License-Identifier: CC0-1.0
 #pragma once
 
-//TODO: move this to kconfig someday
-#define BL00MBOX_MAX_BUFFER_LEN 256
-#define BL00MBOX_DEFAULT_CHANNEL_VOLUME 3000
+//TODO: move this to kconfig someday?
+#define BL00MBOX_MAX_BUFFER_LEN 128
+#define BL00MBOX_DEFAULT_CHANNEL_VOLUME 8000
 #define BL00MBOX_CHANNELS 32
 #define BL00MBOX_BACKGROUND_MUTE_OVERRIDE_ENABLE
 
-//TODO: remove st3m scope dependency
-#include "st3m_audio.h"
-#include "st3m_scope.h"
-
 #include <stdio.h>
 #include <math.h>
 #include <string.h>