cfw: make CanvasBasedWindow apply default styles, set title

[OliverO2]

Proposed Changes

• Integrate style settings to use the entire inner window into CanvasBasedWindow for a better out-of-the-box experience, omitting the need for external style declarations.
• Support setting the HTML title element (parameter was unused before).

Testing

Test: Adapted the mpp/demo app, tested appearance, resizing, title parameter set/unset.

Remarks

Style settings are limited to the necessary and sufficient set of styles required by browsers as verified via

• https://www.freecodecamp.org/news/html-page-width-height
• https://developer.mozilla.org/en-US/docs/Web/CSS/Cascade#user-agent_stylesheets
• https://github.com/necolas/normalize.css/blob/master/normalize.css
• https://caniuse.com/

[eymar]

Thank you!

[OliverO2]

Excellent cooperation. Thank you!