Fix stack splitting overflow (>65k)#177

When splitting a item stack over 65535 an overflow happens.
Looks like it’s a longstanding oversight and it is causing pain for years.
For some bizzare reason "MoveItem" RPC is using UInt16 type for amount whilst item amount type is always Int32.

Would be amazing to have this finally fixed.

Changed MoveItem amount to an int32 (modder request)

• garry on main