Add new actuator : PWM controller (#737)

* Initial generalization from a PWM LED controller, to a PWM controller.
Allow the config file to set the name of each channel and the number of channels.
Fade time is now per-channel, so MQTT messages can genuinely set an individual channel, and specify the fade time for that channel.
The default gamma is configurable in the config.

main/main.ino

@@ -125,6 +125,9 @@ unsigned long timer_sys_measures = 0;
 #ifdef ZactuatorFASTLED
 #  include "config_FASTLED.h"
 #endif
+#ifdef ZactuatorPWM
+#  include "config_PWM.h"
+#endif
 #if defined(ZboardM5STICKC) || defined(ZboardM5STACK)
 #  include "config_M5.h"
 #endif
@@ -630,6 +633,9 @@ void setup() {
 #ifdef ZactuatorFASTLED
   setupFASTLED();
 #endif
+#ifdef ZactuatorPWM
+  setupPWM();
+#endif
 #ifdef ZsensorDS1820
   setupZsensorDS1820();
 #endif
@@ -1201,6 +1207,9 @@ void loop() {
 #endif
 #ifdef ZactuatorFASTLED
       FASTLEDLoop();
+#endif
+#ifdef ZactuatorPWM
+      PWMLoop();
 #endif
     } else {
       connectMQTT();
@@ -1331,6 +1340,9 @@ void stateMeasures() {
 #  ifdef ZactuatorFASTLED
   modules = modules + ZactuatorFASTLED;
 #  endif
+#  ifdef ZactuatorPWM
+  modules = modules + ZactuatorPWM;
+#  endif
 #  ifdef ZboardM5STACK
   M5.Power.begin();
   SYSdata["m5-batt-level"] = (int8_t)M5.Power.getBatteryLevel();
@@ -1456,6 +1468,9 @@ void receivingMQTT(char* topicOri, char* datacallback) {
 #  ifdef ZactuatorFASTLED
     MQTTtoFASTLED(topicOri, jsondata);
 #  endif
+#  ifdef ZactuatorPWM
+    MQTTtoPWM(topicOri, jsondata);
+#  endif
 #  if defined(ZboardM5STICKC) || defined(ZboardM5STACK)
     MQTTtoM5(topicOri, jsondata);
 #  endif