Add GPUDeterminismMode to isoproperties.
DVDInterface: CAV disc drive

Changes the read speed of GC discs from 3 MiB/s to 2-3.3 MiB/s,
depending on the location of the data. I also attempted to change the
speeds for Wii discs, but it has very little effect right now because
Wii games use IPC_HLE instead of DVDInterface. It does affect Wii
homebrew that reads Wii discs, though.
DVDInterface: Add a delay for commands other than regular reads

Behavior inspired by WII_IPC_HLE_Device_DI.
OGL: implement bounding box support with ssbo

This implemention tries to be as accurate as the old SW implemention, but it will remove the dependcy of our vertexloader on videosw.
Various country flag improvements

* Added country flags for games from Netherlands and Spain
* Added separate category for Region Free games (Uses European flag as placeholder)
* Added missing country filter options in "show regions" menu
* Rearranged country filters for readability
* Incremented CACHE_REVISION

Also fixed various country filters not showing up as options in the "Show regions" menu.
Removed SDK flag

SDK is not an official Nintendo country code, and is not actually used
by any official software.
Converted country flags for DolphinQt
Merge pull request #1456 from Stevoisiak/AddCountries

Additional Country Filters
Merge pull request #1515 from RachelBryk/gpudeterminism-isoprops

Add GPUDeterminismMode to isoproperties.
Merge pull request #1550 from degasus/bbox

OGL: implement bounding box support with ssbo
Merge pull request #1517 from JosJuice/cav-disc-drive

DVDInterface: Timing accuracy improvements
Fixed the fast disc speed option (immediately service the interrupt instead of going through the scheduler).
Merge pull request #1578 from skidau/Fix-Fast-Disc-Speed

Fixed the fast disc speed option (immediately service the interrupt instead of going through the scheduler).