ScratchCPP Render 0.4.0

Change log:

• Implemented text bubbles (#22, #23).
• Disabled smooth sampling for targets (improves performance when there are a lot of sprites).
• Implemented question text box (#24).
• Updated libscratchcpp to v0.8.0 (https://github.com/scratchcpp/libscratchcpp/releases/tag/v0.8.0).
• Added mouse wheel support (#49).

Full Changelog: v0.3.0...v0.4.0