Issue #98: Fixing ZigBee code generator

src/main/java/tmltranslator/modelcompiler/CCodeGenConstants.java

+package tmltranslator.modelcompiler;
+
+public interface CCodeGenConstants {
+	
+	String CR = "\n";
+	String CR2 = "\n\n";
+	String TAB = "\t";
+	String TAB2 = "\t\t";
+	String TAB3 = "\t\t\t";
+	String TAB4 = "\t\t\t\t";
+	String SP = " ";
+	String SC = ";";
+
+    String NATURAL_TYPE = "int";
+    String BOOLEAN_TYPE = "bool";
+
+    String DEFAULT_NUM_VAL = "0";
+	String DEFAULT_BOOL_VAL = Boolean.FALSE.toString();
+	String USER_TO_DO = "/* USER TO DO */";
+}