SDK 20.1(v5.5) release.
Native SDK:
* Added PVRVk helper files to the PVRVk project.
* Added the Multithreading example for OpenGL ES showing how to load assets asynchronously in a worker thread while something else is rendered on the main thread.
* Added the Binary Shader for OpenGL ES example showing how to load and save shaders to and from binary files.
* Added the Pipeline Cache for Vulkan example showing how to load and save the pipeline cache to and from a binary file.
* Added code to ensure examples exiting due to an error will have the error code correctly propagated to the command line.
* Added a .gitignore file to ignore the /build folder.
* Ported the basic rendering (BumpMapping) example to OpenGL ES.

* Updated Gradle wrappers to version 6, Android plugin to 3.5.3 and glslang version to 8.13.3559, Vulkan headers and PVRVk to version 1.2.
* Updated and upgraded the PVRCamera framework module. The Android runtime permission system is now implemented, and the asynchronous permissions functionality now works properly.
* Updated the pvr::utils::createOnScreenXXX interfaces. Previously these would not work correctly with Multisampling and other more complicated interfaces.
* Updated the interfaces involving the SDK taking pointers to VMA Allocators, which were smart pointers already, to taking just the smart pointers.

* Modified CMake files that download external dependencies and generated files to generate them in the cmake binary directory to keep the source tree clean.
* Enabled the use of VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT.
* Changed the Gradle wrappers to use full src+bin Gradle distributions so that Android Studio now displays Gradle autocomplete.
* Enhanced the IntroducingPVRCamera example to correctly handle different aspect ratios between the framebuffer and the camera output.
* Improved the EGL Context API. Shared contexts are no longer separately wrapped objects (SharedEGLContext), but simply EGLContexts. The API has been similarly streamlined.

* Fixed the implementation of multisampling on-screen framebuffers for Vulkan. Multisampling will be correctly enabled when setting the number of samples to greater than 1 in DisplayAttributes.
* Fixed the implementation of appendPNext so that the new pNext structure is actually appended to the current base structure.
* Fixed a flag in OpenGL ES 3 that could make the SwiftShader implementation act as if some textures were mipmap-incomplete.
* Fixed an issue, by adding the getWriteAssetStream function, where the Asset Stream would be write files by default in the wrong location on Android.
* Removed the non-functional Java onCreate functions from all examples except IntroducingPVRCamera. The rest of the examples were only calling super.onCreate.

PVRVFrame:
* Fixed a bug on Windows where a config would claim to have stencil support but the underlying config wouldn't.
* Fixed a bug where framebuffer functions would return GL_INVALID_OPERATION if the read framebuffer was being modified.

Refer to our release notes for more details about the changes:
https://www.imgtec.com/developers/powervr-sdk-tools/whats-new/#2020r1