Added support for 64bit ticks (#3768)

Fixes #3017

Thanks to Hercules for the idea and their implementation of it.

This deprecates Windows XP support. If you want to use it to run your server on it, you have to forcefully enable it now.
Since 64bit ticks do not exist on XP, you might encounter some issues that are already fixed on other OS.

src/char/char.cpp

@@ -67,8 +67,6 @@ struct s_subnet {
 } subnet[16];
 int subnet_count = 0;
 
-TIMER_FUNC(char_chardb_waiting_disconnect);
-
 DBMap* auth_db; // uint32 account_id -> struct auth_node*
 DBMap* online_char_db; // uint32 account_id -> struct online_char_data*
 DBMap* char_db_; // uint32 char_id -> struct mmo_charstatus*