Rewrite statusled implementation.

- Read it now from app.config JSON file.
- Allow for inverted status leds (Sonoff et al)
- Clean up unit tests.

unittest/Makefile

@@ -9,7 +9,7 @@ default: $(TARGET)
 all: default
 
 OBJECTS = $(patsubst %.c, %.o, $(wildcard *.c))
-SRCS    = frozen/frozen.c ../src/channel.c ../src/mqtt.c ../src/led.c
+SRCS    = frozen/frozen.c ../src/channel.c ../src/mqtt.c ../src/statusled.c
 HEADERS = $(wildcard *.h)
 
 %.o: %.c $(HEADERS)

unittest/testdata/testconfig0.json

@@ -1,6 +1,7 @@
 {
-  "name": "3 Gang",
-  "status_led": 0,
+  "name": "3 Gang, inverted statusled",
+  "statusled": 9,
+  "statusled_invert": true,
   "channels": [
     { "led": 2,  "relay": 15, "button": 5  },
     { "led": 14, "relay": 4,  "button": 3  },

unittest/testdata/testconfig1.json

@@ -1,6 +1,6 @@
 {
   "name": "3 Gang, No LEDs",
-  "status_led": -1,
+  "statusled": -1,
   "channels": [
     { "led": -1, "relay": 15, "button": 5  },
     { "led": -1, "relay": 4,  "button": 3  },