Methane Asteroids v0.6.5

• Asteroids sample was split from Methane Kit repository to demonstrate external framework usage scenario. Previous versions of this sample can be found as a part of Methane Kit releases.
• Linux platform and Vulkan API are now supported via Methane Kit v0.6.5 along with many other Graphics API improvements.
• Asteroids scene complexity can be changed now with single-key shortcuts 0 .. 9.
• Perlin Noise external library by Stefan Gustavson was split from Methane Externals to a separate repository and is now used directly by Methane Asteroids via PerlinNoise wrapper class.
• External Package management was switched from Git submodules to CPM - Cmake Package Manager.
• Simplified CI build system was setup using GitHub Actions.