!this triggered a OperatorWhitespace violation, fixes #346 (#348)

Author: AlexHaxe

src/checkstyle/utils/TokenTreeCheckUtils.hx

@@ -63,6 +63,7 @@ class TokenTreeCheckUtils {
 			case Const(_): true;
 			case POpen: true;
 			case Kwd(KwdMacro): true;
+			case Kwd(KwdThis): true;
 			default: false;
 		}
 	}

test/checks/whitespace/OperatorWhitespaceCheckTest.hx

@@ -405,6 +405,8 @@ abstract OperatorWhitespaceCheckTests(String) to String {
 		function test() {
 			if (!test) return a++;
 			if ( !test ) return a++;
+			if ( !this.func() ) return a++;
+			if ( !super.func() ) return a++;
 			++a;
 			return !(a++);
 			return !( a++ );