Refactoring on `utils.cc' and adjacents

Completely removed the `utils.cc' by moving residual functions into
sub-classes of `utils/'

src/utils/decode.h

@@ -0,0 +1,40 @@
+/*
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+#include <ctime>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "modsecurity/modsecurity.h"
+#include "src/utils/msc_string.h"
+
+#ifndef SRC_UTILS_DECODE_H_
+#define SRC_UTILS_DECODE_H_
+
+
+namespace modsecurity {
+namespace utils {
+
+
+int urldecode_nonstrict_inplace(unsigned char *input,
+    uint64_t input_len, int *invalid_count, int *changed);
+std::string uri_decode(const std::string & sSrc);
+
+
+}  // namespace utils
+}  // namespace modsecurity
+
+#endif  // SRC_UTILS_DECODE_H_