ScratchCPP Player 0.3.0

Change log:

• Added mute audio option (#16, #17)
• Added high quality pen option (#18).
• Updated scratchcpp-render to v0.6.0 (https://github.com/scratchcpp/scratchcpp-render/releases/tag/v0.6.0)
• Updated Qt to 6.7.

Full Changelog: v0.2.0...v0.3.0