Theme customisation/designer

[v-c0de]

Possibility of user's customising and creating their own themes for the editor.

These can then be shared with other users (and also makes it more customisable).

Example:

https://www.renfei.org/snippets-lab/

[antonreshetov]

@v-c0de I thought about it, but I did not implement it because honestly I do not see the point. Perhaps I will add more themes in the future