Sam Lantinga c699f3d1d8 Updated SDL high DPI support
We have gotten feedback that abstracting the coordinate system based on the display scale is unexpected and it is difficult to adapt existing applications to the proposed API.

The new approach is to provide the coordinate systems that people expect, but provide additional information that will help applications properly handle high DPI situations.

The concepts needed for high DPI support are documented in README-highdpi.md. An example of automatically adapting the content to display scale changes can be found in SDL_test_common.c, where auto_scale_content is checked.

Also, the SDL_WINDOW_ALLOW_HIGHDPI window flag has been replaced by the SDL_HINT_VIDEO_ENABLE_HIGH_PIXEL_DENSITY hint.

Fixes https://github.com/libsdl-org/SDL/issues/7709
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These are test programs for the SDL library:

	checkkeys	Watch the key events to check the keyboard
	loopwave	Audio test -- loop playing a WAV file
	loopwavequeue	Audio test -- loop playing a WAV file with SDL_QueueAudio
	testsurround	Audio test -- play test tone on each audio channel
	testaudioinfo	Lists audio device capabilities
	testerror	Tests multi-threaded error handling
	testfile	Tests RWops layer
	testgl		A very simple example of using OpenGL with SDL
	testiconv	Tests international string conversion
	testjoystick	List joysticks and watch joystick events
	testkeys	List the available keyboard keys
	testloadso	Tests the loadable library layer
	testlocale  Test Locale API
	testlock	Hacked up test of multi-threading and locking
	testmouse	Tests mouse coordinates
	testmultiaudio	Tests using several audio devices
	testoverlay	Tests the overlay flickering/scaling during playback.
	testplatform	Tests types, endianness and cpu capabilities
	testsem		Tests SDL's semaphore implementation
	testshape	Tests shaped windows
	testsprite	Example of fast sprite movement on the screen
	testthread	Hacked up test of multi-threading
	testtimer	Test the timer facilities
	testver		Check the version and dynamic loading and endianness
	testwm		Test window manager -- title, icon, events
	torturethread	Simple test for thread creation/destruction
	gamepadmap   Useful to generate Game Controller API compatible maps



This directory contains sample.wav, which is a sample from Will Provost's
song, The Living Proof:

     From the album The Living Proof
     Publisher: 5 Guys Named Will
     Copyright 1996 Will Provost

You can get a copy of the full song (and album!) from iTunes...

    https://itunes.apple.com/us/album/the-living-proof/id4153978

or Amazon...

    http://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH

Thanks to Will for permitting us to distribute this sample with SDL!