DVD read chunking

Splits DVD reads up into smaller chunks so that data is available
before the final interrupt is triggered. This better simulates the DMA
that happens on a real device, which some games will take advantage of -
by either playing back data as it is loading or by using data that is
going to be overwritten shortly by an outstanding read.

Source/Core/Core/State.cpp

@@ -71,7 +71,7 @@ static Common::Event g_compressAndDumpStateSyncEvent;
 static std::thread g_save_thread;
 
 // Don't forget to increase this after doing changes on the savestate system
-static const u32 STATE_VERSION = 75;  // Last changed in PR 4857
+static const u32 STATE_VERSION = 76;  // Last changed in PR 4829
 
 // Maps savestate versions to Dolphin versions.
 // Versions after 42 don't need to be added to this list,