Rework backend add MQTT and WebSocket support

* Update back end to add MQTT and WebSocket support
* Update demo project to demonstrate MQTT and WebSockets
* Update documentation to describe newly added and modified functionallity
* Introduce separate MQTT pub/sub, HTTP get/post and WebSocket rx/tx classes
* Significant reanaming - more accurate class names
* Use PROGMEM_WWW as default
* Update README documenting PROGMEM_WWW as default
* Update README with API changes

src/main.cpp

@@ -1,12 +1,18 @@
-#include <DemoProject.h>
 #include <ESP8266React.h>
+#include <LightMqttSettingsService.h>
+#include <LightStateService.h>
 #include <FS.h>
 
 #define SERIAL_BAUD_RATE 115200
 
 AsyncWebServer server(80);
 ESP8266React esp8266React(&server, &SPIFFS);
-DemoProject demoProject = DemoProject(&server, &SPIFFS, esp8266React.getSecurityManager());
+LightMqttSettingsService lightMqttSettingsService =
+    LightMqttSettingsService(&server, &SPIFFS, esp8266React.getSecurityManager());
+LightStateService lightStateService = LightStateService(&server,
+                                                        esp8266React.getSecurityManager(),
+                                                        esp8266React.getMqttClient(),
+                                                        &lightMqttSettingsService);
 
 void setup() {
   // start serial and filesystem
@@ -22,8 +28,11 @@ void setup() {
   // start the framework and demo project
   esp8266React.begin();
 
-  // start the demo project
-  demoProject.begin();
+  // load the initial light settings
+  lightStateService.begin();
+
+  // start the light service
+  lightMqttSettingsService.begin();
 
   // start the server
   server.begin();
@@ -32,7 +41,4 @@ void setup() {
 void loop() {
   // run the framework's loop function
   esp8266React.loop();
-
-  // run the demo project's loop function
-  demoProject.loop();
 }