Delegate canvas resizing

[raphaelameaume]

This PR delegates the resize of the canvas to the Renderer or the sketch file itself (see blank example) instead of applying canvas.width and canvas.height.

This has several files benefits such as:

• not going against external library
• fixing canvas blinking on resize
• removing black canvas showing up when resizing with p5.js renderers
• fix cross browser display

Details

• Handle canvas resize in blank template
• Handle canvas resize in fragment-gl renderer
• Handle canvas resize in 2d renderer
• Simplify canvas resize in p5.js renderers
• Compute canvas display size with new CSS features