simplify observer for signals

Signed-off-by: Michael Leuschel <leuschel@uni-duesseldorf.de>

Train_B_Book/train.json

@@ -72,54 +72,16 @@
         "value": "IF N : OCC THEN \"#FF2222\" ELSE IF N : resbl THEN \"#2222FF\" ELSE \"#000000\" END END"
     },
     {
-        "id": "s1_green",
+	    "for": {"from":1, "to":5},
+        "id": "s%0_green",
         "attr": "fill",
-        "value": "IF S1 : GRN THEN \"#22FF22\" ELSE \"#F6FFD5\" END"
+        "value": "IF S%0 : GRN THEN \"#22FF22\" ELSE \"#F6FFD5\" END"
     },
     {
-        "id": "s1_red",
+	    "for": {"from":1, "to":5},
+        "id": "s%0_red",
         "attr": "fill",
-        "value": "IF S1 : GRN THEN \"#FFD5D5\" ELSE \"#FF2222\" END"
-    },
-    {
-        "id": "s2_green",
-        "attr": "fill",
-        "value": "IF S2 : GRN THEN \"#22FF22\" ELSE \"#F6FFD5\" END"
-    },
-    {
-        "id": "s2_red",
-        "attr": "fill",
-        "value": "IF S2 : GRN THEN \"#FFD5D5\" ELSE \"#FF2222\" END"
-    },
-    {
-        "id": "s3_green",
-        "attr": "fill",
-        "value": "IF S3 : GRN THEN \"#22FF22\" ELSE \"#F6FFD5\" END"
-    },
-    {
-        "id": "s3_red",
-        "attr": "fill",
-        "value": "IF S3 : GRN THEN \"#FFD5D5\" ELSE \"#FF2222\" END"
-    },
-    {
-        "id": "s4_green",
-        "attr": "fill",
-        "value": "IF S4 : GRN THEN \"#22FF22\" ELSE \"#F6FFD5\" END"
-    },
-    {
-        "id": "s4_red",
-        "attr": "fill",
-        "value": "IF S4 : GRN THEN \"#FFD5D5\" ELSE \"#FF2222\" END"
-    },
-    {
-        "id": "s5_green",
-        "attr": "fill",
-        "value": "IF S5 : GRN THEN \"#22FF22\" ELSE \"#F6FFD5\" END"
-    },
-    {
-        "id": "s5_red",
-        "attr": "fill",
-        "value": "IF S5 : GRN THEN \"#FFD5D5\" ELSE \"#FF2222\" END"
+        "value": "IF S%0 : GRN THEN \"#FFD5D5\" ELSE \"#FF2222\" END"
     }
 ],
     "events": [