Refactor: Add a inkscape backup using cairosvg as a dependency

[omararvin]

I am like most of the people don't have inkscape installed and I am not willing to install it. so adding cairosvg as a dependency will save time and will make sure basic functionalities work on any freshly clones repo

[omararvin]

Hi, @Azeirah. I have just noticed that one of the open PRs is yours and covers the same thing #38 . So what do you think about this one?

[Azeirah]

I've been running cairo as a backend for a couple hundred users for a few months, the issues are little, the upsides are numerous:

1. No need to install an external dependency, cairo is a library not a program
2. It's much faster
3. It's much smaller
4. It is much less verbose in logging errors and warnings that are completely unrelated to anything rmc does
5. The rendering quality is great

The only disadvantage I've found so far is that it doesn't embed fonts