Add feature to cache ISOs in RAM to avoid I/O stutters. 64-bit only. Loading gets slow though.

TODO: Make it cache in the background on load. Allow on 32-bit for small ISOs.

Core/Config.cpp

@@ -295,6 +295,7 @@ static ConfigSetting generalSettings[] = {
 	// "default" means let emulator decide, "" means disable.
 	ConfigSetting("ReportingHost", &g_Config.sReportHost, "default"),
 	ConfigSetting("AutoSaveSymbolMap", &g_Config.bAutoSaveSymbolMap, false),
+	ConfigSetting("CacheFullIsoInRam", &g_Config.bCacheFullIsoInRam, false),
 
 #ifdef ANDROID
 	ConfigSetting("ScreenRotation", &g_Config.iScreenRotation, 1),