Core: Fix many "errors"/warnings and coding style (1)

Extractors, worldserver, authserver, shared and collision affected

Errors were found using Cppcheck, open-source static analysis tool

src/server/shared/DataStores/DBCFileLoader.cpp

@@ -23,10 +23,8 @@
 #include "DBCFileLoader.h"
 #include "Errors.h"
 
-DBCFileLoader::DBCFileLoader()
+DBCFileLoader::DBCFileLoader() : stringTable(NULL), data(NULL), fieldsOffset(NULL)
 {
-    data = NULL;
-    fieldsOffset = NULL;
 }
 
 bool DBCFileLoader::Load(const char* filename, const char* fmt)