[Patch] Draw and scribble notes in GNU Emacs

[Anand Tamariya]

Here's a proposal for drawing and scribbling notes in GNU Emacs.

Features:

• Draw simple shapes and text
  
• Scribble freehand
• Visual selection using mouse
• Zoom
• Undo/delete selection
• Erase
  

Code: https://gitlab.com/atamariya/emacs/-/blob/dev/lisp/svg.el

Screenshots: https://lifeofpenguin.blogspot.com/2021/08/scribble-notes-in-gnu-emacs.html

Video: https://youtu.be/oj2OR5ytHx

I have few questions:

- Can this be included in Emacs core?

- I've copied two functions from Lars (https://github.com/larsmagne/ewp/blob/master/ewp.el ). How should attribution work in this case?

Additionally, following are mandatory patches for svg.el:

- polyline point uses CSV pairs separated by space.

- id should ideally be unique. This will allow changing element type when different element with same id is added.

- If value is nil, don't include the attribute in the print output.

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