Monster Modes

[aleos89]

The drop rate feature for the item/mob databases needs to be updated to reflect rathena/rathena@55e4df1. MD_BOSS no longer exists and should be changed to 0x6200000 which is the Aegis mode that defines "Boss" monsters.

Also, it may be wise to add a "MVP" type in the servers.php DropRates array so it can be separated from the Boss monsters. It can be as simple as checking for 0x80000, MVP Item Drops, or MVP EXP. The most reliable option of the 3 would be to check for the mode.