ScratchCPP Render 0.9.0

Change log:

• Added stopLoading() function to ProjectPlayer.
• Added support for pen rendering in stage (#78).
• Added support for macOS.
• Updated libscratchcpp to v0.13.1 (https://github.com/scratchcpp/libscratchcpp/releases/tag/v0.13.1).

Full Changelog: v0.8.0...v0.9.0