Fixed alpha blending for the MMX blit functions

I see the Remarks of function SDL_BlitSurface shows that "when SDL_BLENDMODE_BLEND, we have dstA = srcA + (dstA * (1-srcA))". however, I tested some pictures but the result implies "dstA=arcA" actually. I stepped into the source code, and found after I set SDL_BLENDMODE_BLEND for the source surface, the final blit function is BlitRGBtoRGBPixelAlphaMMX when I use SDL_BlitSurface on my computer. And I found these codes:

else if (alpha == amask) {
/* opaque alpha -- copy RGB, keep dst alpha */
*dstp = (*srcp & chanmask) | (*dstp & ~chanmask);

The same code is used in BlitRGBtoRGBPixelAlphaMMX3DNOW and BlitRGBtoRGBPixelAlpha. So I think they still keep dst alpha.

Best regards,
Jianyu Guan

Fix bug 2034: replace printf by SDL_Log in tests; update loopwave VS solution: copy missing dependency

Don't print "unrecognized key" message for an X11 keycode of 0. This can happen with composed characters.

Fixed the tag name for the SDL 2.0 release

Mac: Fix restoring of Cmd-H-hidden fullscreen desktop windows.

This should fix http://bugzilla.libsdl.org/show_bug.cgi?id=1996

Added Julian Winter to the credits for the SDL 2.0 website.

Added tag release_2.0.0 for changeset d6a8fa507a45

Fixes #2022, do not resume on Android when surfaceChanged

If the app is in landscape mode and the user presses the power button, a pause
is followed immediately by a surfaceChanged event because the lock screen
is shown in portrait mode. This triggers a "false" resume.
So, we just pause and resume following the onWindowFocusChanged events.

Also, wait for SDL_APP_WILLENTERBACKGROUND and SDL_APP_DIDENTERBACKGROUND before
blocking the event pump.

Fixed bug 2027 - Full-screen appears to be broken - hang in SDL_DestroyWindow()

Rainer Deyke

I'm running Linux Mint 15 with the Cinnamon window manager. SDL_DestroyWindow consistently locks up for me when the window if fullscreen.

Added missing call to SDL_stack_free().
On Windows this is needed because SDL_stack_alloc() wraps SDL_malloc().