Vulkan Pre-rotation Demo

After git clone

1. git submodule init
2. git submodule update

What's covered?

1. Detect all surface rotations in Android 10+(easier if landscape only without resizing).
2. Handle swapchain recreation.
3. Fix the shaders in clipping space with a simple 2x2 matrix.
4. NativityActivity, AChoreographer, etc.

What's not covered?

1. Detect surface rotation in Android Pie and below, which can be fixed by either calling vkGetPhysicalDeviceSurfaceCapabilitiesKHR or the jni Display.getRotation() once a while.
2. Fix advanced shader features like dfdx and dfdy, which can be fixed by mapping the intended derivative to +-dfdx or +-dfdy according to preTransform pushed to the shader.
3. Other miscellaneous.