Primitives support

[AnonMiraj]

Here is a list of the primitives that I plan to support. Items marked with "?" are aspects I am still unsure how to implement:

• Lines
• Rectangle
  • Rounded corners?
• Circles
• Ellipses
• Triangles
• Polygons
• Polylines
• Bézier curves
• Paths? (https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths)
• Drawing text

All primitives should support attributes like stroke size, stroke color, and fill color.
Anti-aliasing should be enabled by default.

[AnonMiraj]

I initially intended to support stroke_size from the beginning,
but I have been struggling to find a suitable approach for drawing thick lines.
I have tried using a polygon and an edited version of Bresenham's algorithm,
but the lines look different from their SVG counterpart.

I still need to research more on how SVG renders thick lines.