Adds the data bitfield and ok_to_mqtt bit (#4643)

* Don't filter PKI packets just for being encrypted.

* Add ok_to_mqtt config and bit

* Bitfield

* Adjust dontmqttmebro logic.

* Manipulate bitfield only in router.cpp

* Want_ack is not want_response

* Bitfield macros

* Use new Bitfield macro in MQTT.cpp

---------

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

src/mesh/Channels.cpp

@@ -13,10 +13,6 @@
 #include "mqtt/MQTT.h"
 #endif
 
-/// 16 bytes of random PSK for our _public_ default channel that all devices power up on (AES128)
-static const uint8_t defaultpsk[] = {0xd4, 0xf1, 0xbb, 0x3a, 0x20, 0x29, 0x07, 0x59,
-                                     0xf0, 0xbc, 0xff, 0xab, 0xcf, 0x4e, 0x69, 0x01};
-
 Channels channels;
 
 const char *Channels::adminChannel = "admin";