Implement FDB Checksum

- Added config option `check_fdb`
- Added check in WorldServer.cpp
- Added raw MD5 function in MD5.cpp and MD5.h

dCommon/MD5.cpp

@@ -115,6 +115,14 @@ MD5::MD5(const std::string &text)
     finalize();
 }
 
+// raw md5 construstor
+MD5::MD5(const char * input, size_type length)
+{
+    init();
+    update(input, length);
+    finalize();
+}
+
 //////////////////////////////
 
 void MD5::init()

dCommon/MD5.h

@@ -54,6 +54,7 @@ public:
     
     MD5();
     MD5(const std::string& text);
+    MD5(const char * input, size_type length);
     void update(const unsigned char *buf, size_type length);
     void update(const char *buf, size_type length);
     MD5& finalize();