Add configuration for semaphore signals and implement railway signal control

semaphore-config.json

@@ -0,0 +1,16 @@
+{
+    "semaphores": [
+        {
+            "id": 1,
+            "pin": 15,
+            "bpp": 4,
+            "lamps": [
+                {"color": "RED", "id": 101},
+                {"color": "YELLOW", "id": 102},
+                {"color": "GREEN", "id": 103},
+                {"color": "MOON_WHITE", "id": 104},
+                {"color": "BLUE", "id": 105}
+            ]
+        }
+    ]
+}