Emscripten: Fixed crash if closing removed joystick (thanks, Sylvain!).

Android: Fixed crash if closing removed joystick (thanks, Sylvain!). Fixes fix for Bugzilla #3408.

WinRT: fixed bug where Win10 GameBar, when shown + hidden, might not restore a cursor's hidden state The repro steps were this: 1. run an sdl2 winrt/uwp app, on Win10, v10.0.10586.0 or higher 2. hide the cursor, via a call to SDL_ShowCursor(0) 3. make the Win10 game bar appear, by pressing the Windows + G hotkey 4. observe that the mouse cursor appears, in order to interact with the game bar (this is expected behavior) 5. make the Win10 game bar disappear, either by pressing the Windows + G hotkey again, or clicking somewhere in the app EXPECTED RESULT: cursor disappears, as game bar disappears ACTUAL RESULT: cursor didn't always disappear

Added link in header comment.

Emscripten: Fixed opening previously closed joystick.

Android: Fixed opening previously closed joystick (thanks, Sylvain!). Fixes Bugzilla #3408.

[ OSX ] enables Xbox One S Guide (System Main Menu) button detection. the one possible impact is that since button identifiers on OSX are just their sequence in the HID report descriptor we might change the button order, and any existing/saved mappings may get their order changed.

Add Xbox One controller GUIDs to the XInput filter in the DirectInput joystick driver. The Windows 10 Anniversary Update (1607) breaks the method uses that SDL uses to detect XInput devices. That is, on Windows 10 Anniversary Update, it is no longer possible to query RAWINPUT for HID devices, and check for "IG_" in the device name. Presumably, this will be fixed in the future. This patch works around the issue by adding the Xbox One controller series to the well-known device list. This skips the more expensive RAWINPUT check for those devices, and causes them to be detected as XInput devices once again.

Fixed two old identifiers in header comments.

PSP: Fixed memory leak if video init failed.