Make colors customizable to solve color related issues [enhancement]

[Cutuchiqueno]

It would be very helpful to add the possibility to change colors. In a rc file for example. I am using bas16 based color scheme in Xressources that has a slightly different color distribution including more grey colors. Thus my output does not look so nice:

Probably, users of the solarized color theme will have the same issues. And to make colors customizable is a better solution than messing up the code where the colors are defined.

[raedah]

I am having this issue as well.

[kurokirasama]

my posts look green which is nice but other post look blue, on a black background, so not really readable

[Paulchen232]

Change .Xresources and search with Google or something else fore info's. To switch off the color in Telegram-cli use -C.
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