Terminal canvas renderer

[Tyriar]

#34169

• Windows - @alexandrudima
• Linux - @roblourens
• macOS - @seanmcbreen

Complexity: 4

All rendering done by the terminal has moved from a completely DOM-based model to using canvas instead. Here are some things to focus on and look out for:

• Unicode characters, emojis, etc. behave correctly
  -,Tweaking the terminal settings, font size/family and line height in particular
• Blurry text, lack of sub-pixel anti-aliasing
• The rows/columns not being the correct size for the panel
• Rows being cut off on the top
• Mouse coordinates when using selection, links and xterm mouse events are accurate
• Changing the window zoom level works as expected

[alexdima]

Nice job!