[enhancement] use rich Python library to prettify output of khal printics

[tgy]

everything's in the title

i just used the khal printics command and i'm sure we can do better!

the rich library is pretty awesome and could be used for that purpose

[geier]

I agree, we totally can do better.

I had a look at rich and textual #1171 (which is from the same people and probably built on top of rich) some time ago and it looks pretty good. My issue at the moment is, that I would prefer if the ways khal and ikhal draw it's UI converges rather than diverges. Re-doing ikhal in textualize looks like a lot of work.

For the moment I would suggest not to spend too much work on doing this in rich, but let's discuss.

[tgy]

i agree this is not the number 1 priority, but opened the issue anyway so as not to forget about it :-)

[maxclac]

That would be amazing!