[Why]
In some case, people may need x86 ABI version apk if they develop on x86 Android.
Support x86_64 ABI by default is better.
[How]
Add android::ndk::abiFilters property "x86_64".
* Started updating ray tracing samples to KHR extension
* Updated GLSL shaders to use GL_EXT_ray_tracing
* Code cleanup, naming
* Fix include directories to use Vulkan headers from repository instead of NDK for the Android build
* Added new Android function pointers
* Renamed basic ray tracing sample
Added android build files
* Remove unused batch file
* Replaced remaining NV identifiers
* Updating ray tracing shadow sample to KHR extension
* Updated shaders to use KHR instead of NV extension
Fixed shader bindings
* Updating ray tracing reflections sample to KHR extension
* Renamed ray tracing reflections sample
* Renamed ray tracing shadows sample
Added android build files
* Removed no-longer used batch files for shader generation
* Proper alignment for the shader binding table
* Updated readme
* Reworked shader group setup
* Cleanup
* Reworked shader group setup
* Reworked shader group setup
* Code cleanup
