General code refactoring/improvements in server, treegen and connection

src/database/database-files.cpp

@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "filesys.h"
 #include "server/player_sao.h"
 #include "util/string.h"
+#include <json/json.h>
 #include <cassert>
 
 // !!! WARNING !!!

src/database/database-files.h

@@ -94,7 +94,6 @@ public:
 
 private:
 	Json::Value *getOrCreateJson(const std::string &modname);
-	bool writeJson(const std::string &modname, const Json::Value &json);
 
 	std::string m_storage_dir;
 	std::unordered_map<std::string, Json::Value> m_mod_storage;