Improve SVG path parsing by using the referenced path

[mjmjmtl]

Motivation

In SVG file, a reference path is created for same characters:

When parsing the path in SVGMobject, parsing the reference path is better because:

1. It only stores one copy of path (for same character) in PATH_TO_POINTS cache.
2. The numerical accuracy is slightly better when doing the transform by ourselves.

Proposed changes

Here's the code to test the change:

from manimlib import * from manimlib.mobject.svg.svg_mobject import PATH_TO_POINTS class SVGTransformShowcase(Scene): def construct(self): tex = Tex("aaaaa") tex.scale(3) self.add(tex) print(f"{len(PATH_TO_POINTS)=}") 

before:

after:

Notice the difference in terminal output.