Added continuous ligatures

[Ciubix8513]

A PR for #115
These ligatures make various cli tools look so much nicer:
Cargo:


Pacman:

I was thinking of adding another type, 2 headed ligatures, so that things like <=> can be expanded, but i'm not sure if there's any point in that.

But there's also currently a bug where shorter ligatures are slightly smaller:

I think there might be something wrong with the generateImage function.

[Ciubix8513]

I just fixed the ligatures being smaller bug, so now everything should work as intended

[IdreesInc]

Interesting, this is definitely something I've been meaning to look into. Thank you for working on this, will hopefully be able to review it properly in the next couple of days!
In the meantime, heads up that "continuous" is missing the "u" at the end in the file name so that will need to be fixed before merge

[IdreesInc]

Thanks for your patience with this review, life got in the way.
This looks great, I really appreciate the work your put into this! I am going to make some minor style changes and test its compatibility with beta build before merging into main, but it works like a charm on my machine. Thanks again!