Make mode line indicator customizable

[peniblec]

Largely inspired by Magit's lighters, eg for magit-blame-mode.

Thank you for this package! I like it so much I basically enabled it as globally as I could (ie for fundamental, text, prog and special modes).

(First pull request ever, let me know if I am doing something wrong)

[purcell]

Thanks! I'll merge this, but I'd generally suggest that people use diminish to customize or remove minor mode modeline indicators.

[xiongtx]

How'd we end up with PgLn and not ^L? 😛

[purcell]

How'd we end up with PgLn and not ^L? 😛

Both are a bit ugly, I think. Personally I prefer to completely diminish this minor mode. :-)

[peniblec]

Personally I prefer to completely diminish this minor mode. :-)

I have to admit that diminish does the job perfectly, as I found out literally minutes after you merged this PR. I had no idea this package existed at the time, so thank you for mentioning it!

(On the plus side, I am glad I discovered it, since its "codeprose" was a joy to read. On the minus side, now I have a permanent TODO item in my .emacs asking me to review diminish, dim, rich-minority and delight to figure out which one is "optimal", whatever that's supposed to mean)

[purcell]

On the minus side, now I have a permanent TODO item in my .emacs asking me to review diminish, dim, rich-minority and delight to figure out which one is "optimal", whatever that's supposed to mean)

Haha, I know that feeling. But if you don't know why you need anything but diminish, then diminish is probably all you need. :-)