fix(boards): 修复arduino下变量名大小写不敏感

boards/default_src/arduino/others/names.js

@@ -121,7 +121,7 @@ Names.prototype.getName = function (name, type) {
             name = varName;
         }
     }
-    var normalized = name.toLowerCase() + '_' + type;
+    var normalized = name + '_' + type;
 
     var isVarType = type == Variables.NAME_TYPE ||
         type == Names.DEVELOPER_VARIABLE_TYPE;
@@ -193,7 +193,7 @@ Names.prototype.safeName_ = function (name) {
  * @return {boolean} True if names are the same.
  */
 Names.equals = function (name1, name2) {
-    return name1.toLowerCase() == name2.toLowerCase();
+    return name1 == name2;
 };
 
 export default Names;

boards/default_src/arduino/others/variables.js

@@ -90,7 +90,7 @@ Variables.allVariables = function (root) {
             var varName = blockVariables[y];
             // Variable name may be null if the block is only half-built.
             if (varName) {
-                variableHash[varName.toLowerCase()] = varName;
+                variableHash[varName] = varName;
             }
         }
     }
@@ -222,7 +222,7 @@ Variables.generateUniqueName = function (workspace) {
         while (!newName) {
             var inUse = false;
             for (var i = 0; i < variableList.length; i++) {
-                if (variableList[i].toLowerCase() == potName) {
+                if (variableList[i] == potName) {
                     // This potential name is already used.
                     inUse = true;
                     break;

boards/default_src/python/others/names.js

@@ -52,7 +52,7 @@ class Names {
      * @return {boolean} True if names are the same.
      */
     static equals(name1, name2) {
-        return name1.toLowerCase() == name2.toLowerCase();
+        return name1 == name2;
     }
     /**
      * When JavaScript (or most other languages) is generated, variable 'foo' and