Consider switching back to upstream kjua version

[rugk]

Background

In #188 we switched to to https://github.com/werthdavid/kjua/, a fork of the kjua lib that initially mostly just added SVG support (see lrsjng/kjua#7)

Now, however, the upstream author also added SVG support in a smaller way without an extra lib.

Proposed solution

Switch back to https://github.com/lrsjng/kjua

Alternatives

Keep the fork by @werthdavid given it works. (and maybe has other advantages?)
AFAIK we, however, do not make use of other differences, e.g. a transparent background e.g. is usually always given if we use an SVG. (respectively we always need to specify a color 😉)

Additional context

This could also improve/fix #248, because of a smaller code base without so much eval etc.

[rugk]

@omnjpa27516 And what does this have to do with this issue?
Anyway, if you found a bug, please open a new issue and fill out the issue template.

[rugk]

We do have an issue tracker for tracking bugs. As we use that, we need to have a proper structure with one issue per topic/bug. Otherwise, it will very likely be overlooked. Also, as said, this has nothing to do with this issue.
Also, please mind to use the bug issue template when reporting bugs, so one is able to understand and reproduce it.