Add placeholder_color

[luyu-wu]

Added placeholder_color configuration option that changes placeholder text color!
Hopefully everything is ok and I can become a more major contributer to Hypr stuff in the future (I got pretty moved by the blogpost).
Honestly the implementation is sketch af though, although it works on all cases I've tested it.

[vaxerski]

placeholder text can already be changed with pango markup

[matt1432]

placeholder text can already be changed with pango markup

I feel like this would be a nice abstraction instead of having to do pango markup. I personally had to go through issues to figure it out. (that might be a skill issue on my part but still)

[vaxerski]

it's clear in the docs even with a link?

[plurpio]

this could be useful as "authentication failed" doesn't use pango markdown

[vaxerski]

I'd prefer configuring the text there and not color

[bvr-yr]

what about adding fail_color instead
and maybe on failure change both placeholder and outer color?

one problem with fail placeholder color being inverted, like it is now:
if i use #1b1b1b and #e4e4e4 it's invisible
it's ok for grayish background, but not if fg/bg are nearly inverted by themselves

[vaxerski]

color change for the outer color = ok, but again I'd prefer a configurable text for fail rather than color

[bvr-yr]

u mean just use markup like for normal placeholder?

[vaxerski]

mhm

[bvr-yr]

gonna look at it later
i suppose it is possible to extract parsed color to reuse?

[vaxerski]

dont think so