Fixed support for named character entities.

Parser/src/main/java/org/openzen/zenscript/lexer/ZSTokenType.java

 	T_IDENTIFIER("[a-zA-Z_][a-zA-Z_0-9]*"),
 	T_FLOAT("\\-?(0|[1-9][0-9]*)\\.[0-9]+([eE][\\+\\-]?[0-9]+)?"),
 	T_INT("\\-?(0|[1-9][0-9]*)"),
-	T_STRING_SQ("\"([^\"\\\\]|\\\\([\'\"\\\\/bfnrt]|u[0-9a-fA-F]{4}))*\""),
-	T_STRING_DQ("\'([^\'\\\\]|\\\\([\'\"\\\\/bfnrt]|u[0-9a-fA-F]{4}))*\'"),
+	T_STRING_SQ("\"([^\"\\\\]|\\\\([\'\"\\\\/bfnrt&]|u[0-9a-fA-F]{4}))*\""),
+	T_STRING_DQ("\'([^\'\\\\]|\\\\([\'\"\\\\/bfnrt&]|u[0-9a-fA-F]{4}))*\'"),
 	T_AOPEN("\\{"),
 	T_ACLOSE("\\}"),
 	T_SQOPEN("\\["),

ScriptingExample/scripts/helloworld.zs

-println("Hello world!");
+println("Hello \© world!");
 println(5);
 println(1 + 3);