Add support for signal categories like NL:voor NL:hoofd en NL:snelheid

Author: hiddewie

maxspeed_signals.mss

@@ -885,7 +885,8 @@
     /*****************************************/
     /* NL speed limit light (no main signal) */
     /*****************************************/
-    ["feature"="NL"]["signal_speed_limit_form"="light"] {
+    ["feature"="NL"]["signal_speed_limit_form"="light"],
+    ["feature"="NL:snelheid"]["signal_speed_limit_form"="light"] {
       marker-width: 16;
       marker-height: 16;
       marker-file: url('symbols/nl/speed_limit_light.png');

signals.mss

@@ -798,7 +798,8 @@ Format details:
   /****************************/
   /* NL distant light signals */
   /****************************/
-  ["feature"="NL"]["distant_form"="light"] {
+  ["feature"="NL"]["distant_form"="light"],
+  ["feature"="NL:voor"]["distant_form"="light"] {
     ::text {
       text-name: [ref];
       text-dy: 12;
@@ -1301,7 +1302,8 @@ Format details:
   /*************************/
   /* NL main light signals */
   /*************************/
-  ["feature"="NL"]["main_form"="light"] {
+  ["feature"="NL"]["main_form"="light"],
+  ["feature"="NL:hoofd"]["distant_form"="light"] {
     ::text {
       text-name: [ref];
       text-dy: 12;
@@ -1320,7 +1322,8 @@ Format details:
   /**********************************/
   /* NL repeated main light signals */
   /**********************************/
-  ["feature"="NL"]["main_repeated_states"="NL:272;NL:273"] {
+  ["feature"="NL"]["main_repeated_states"="NL:272;NL:273"],
+  ["feature"="NL:herhaling"]["main_repeated_states"="NL:272;NL:273"] {
     ::text {
       text-name: [ref];
       text-dy: 12;