Resolves #512 Support all state_filter options

lib/cards/card.class.dart

@@ -50,10 +50,67 @@ class HACard {
       if (!ConnectionManager().useLovelace && entityWrapper.entity.isHidden) {
         return false;
       }
-      if (stateFilter.isNotEmpty) {
+      List currentStateFilter;
-        return stateFilter.contains(entityWrapper.entity.state);
+      if (entityWrapper.stateFilter != null && entityWrapper.stateFilter.isNotEmpty) {
+        currentStateFilter = entityWrapper.stateFilter;
+      } else {
+        currentStateFilter = stateFilter;
       }
-      return true;
+      bool showByFilter = currentStateFilter.isEmpty;
+      for (var allowedState in currentStateFilter) {
+        if (allowedState is String && allowedState == entityWrapper.entity.state) {
+          showByFilter = true;
+          break;
+        } else if (allowedState is Map) {
+          try {
+            var tmpVal = allowedState['attribute'] != null ? entityWrapper.entity.getAttribute(allowedState['attribute']) : entityWrapper.entity.state;
+            var valToCompareWith = allowedState['value'];
+            var valToCompare;
+            if (valToCompareWith is! String) {
+              valToCompare = double.tryParse(tmpVal);
+            } else {
+              valToCompare = tmpVal;
+            }
+            if (valToCompare != null) {
+              bool result;
+              switch (allowedState['operator']) {
+                case '<=': { result = valToCompare <= valToCompareWith;}
+                break;
+                
+                case '<': { result = valToCompare < valToCompareWith;}
+                break;
+
+                case '>=': { result = valToCompare >= valToCompareWith;}
+                break;
+
+                case '>': { result = valToCompare > valToCompareWith;}
+                break;
+
+                case '!=': { result = valToCompare != valToCompareWith;}
+                break;
+
+                case 'regex': {
+                  RegExp regExp = RegExp(valToCompareWith.toString());
+                  result = regExp.hasMatch(valToCompare.toString());
+                }
+                break;
+
+                default: {
+                    result = valToCompare == valToCompareWith;
+                  }
+              }
+              if (result) {
+                showByFilter = true;
+                break;
+              }  
+            }
+          } catch (e) {
+            Logger.e('Error filtering ${entityWrapper.entity.entityId} by $allowedState');
+            Logger.e('$e');
+          }
+        }
+      }
+      return showByFilter;
     }).toList();
   }
 

lib/entities/entity.class.dart

@@ -221,7 +221,7 @@ class Entity {
 
   String getAttribute(String attributeName) {
     if (attributes != null) {
-      return attributes["$attributeName"];
+      return attributes["$attributeName"].toString();
     }
     return null;
   }

lib/entities/entity_wrapper.class.dart

@@ -8,13 +8,15 @@ class EntityWrapper {
   String entityPicture;
   EntityUIAction uiAction;
   Entity entity;
+  List stateFilter;
 
 
   EntityWrapper({
     this.entity,
     String icon,
     String displayName,
-    this.uiAction
+    this.uiAction,
+    this.stateFilter
   }) {
     if (entity.statelessType == StatelessEntityType.NONE || entity.statelessType == StatelessEntityType.CALL_SERVICE || entity.statelessType == StatelessEntityType.WEBLINK) {
       this.icon = icon ?? entity.icon;

lib/home_assistant.class.dart

@@ -303,6 +303,7 @@ class HomeAssistant {
                       entity: e,
                       displayName: rawEntity["name"],
                       icon: rawEntity["icon"],
+                      stateFilter: rawEntity['state_filter'] ?? [],
                       uiAction: EntityUIAction(rawEntityData: rawEntity)
                   )
               );
@@ -333,6 +334,7 @@ class HomeAssistant {
                   entity: e,
                   icon: en["icon"],
                   displayName: en["name"],
+                  stateFilter: en['state_filter'] ?? [],
                   uiAction: EntityUIAction(rawEntityData: rawCard)
               );
             } else {

lib/view.class.dart

@@ -74,7 +74,7 @@ class HAView {
 
   Widget buildTab() {
     if (linkedEntity == null) {
-      if (iconName != null) {
+      if (iconName != null && iconName.isNotEmpty) {
         return
           Tab(
               icon: