1. Timestamps
  2. TouchID (the Device ID)
      As inline with the SDL spec, we will pass a touch ID of
      `SDL_TOUCH_MOUSEID` for touch events that are simulated by the
      mouse so games can rely solely on touch events if they like.

Includes the SDL2 Copyright notice on the headers that contain SDL2
content.
Includes a fix to SDL_PeepEvents.

… pull request.

…if no pressure data is present.

…TEN_HAS_UNBOUND_TYPE_NAMES=0, then use a lighter type identifier. This shaves 175 KB off of our engine's minified JavaScript.

…ers and wrapper types.

…f formatting in test_atomic_cxx. Fixes the test on OSX.

…t runner operation.

…sist to user CMake toolchain files. Also CACHE the variable Emscripten, in the hope of that fixing the visibility issue with variable. Some users have reported that in their CMakeLists.txt files the variable EMSCRIPTEN is not always visible, even though in the Emscripten cmake unit tests it always works. Fixes #2288. Thanks mhenschel!

fix_test_atomic_cxx

spidermonkey_none

Embind code size reduction by using lightweight RTTI record for non-polymorphic types

Sdl2 touch api additions