This is a release candidate for 2.30.0

This release fixes audio distortion and a crash when blitting that was introduced in 2.29.1.

In addition to lots of bug fixes, here are the major changes in this release:

General:

• Added support for 2 bits-per-pixel indexed surface formats
• Added the function SDL_GameControllerGetSteamHandle() to get the Steam API handle for a controller, if available
• Added the event SDL_CONTROLLERSTEAMHANDLEUPDATED which is sent when the Steam API handle for a controller changes. This could also change the name, VID, and PID of the controller.

macOS:

• Added the hint SDL_HINT_JOYSTICK_IOKIT to control whether the IOKit controller driver should be used
• Added the hint SDL_HINT_JOYSTICK_MFI to control whether the GCController controller driver should be used
• Added the hint SDL_HINT_RENDER_METAL_PREFER_LOW_POWER_DEVICE to choose whether high or low power GPU should be used for rendering, in the case where there are multiple GPUs available

Xbox:

• Added the function SDL_GDKGetDefaultUser()