allow to set a global font, and render with pango only

[rtgiskard]

Description

Better to provide a global font-family settings, for overlay, splash and the others, instead of the hard coded sans. There are settings to select font for groupbar and splash, another one for the overlay might need to be add.

And, I'm using a local font config like this:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
	<match target="pattern">
		<test name="family" qual="any"><string>sans-serif</string></test>
		<edit name="family" mode="prepend" binding="strong">
			<string>Symbols Nerd Font</string>
			<string>Inconsolata</string>
			<string>LXGW WenKai Mono</string>
		</edit>
	</match>
</fontconfig>

The symbol only nerd font is the first to match, and then the others as fallback, this works well for my other applications, without the need to install many other nerd patched fonts.

However, hyprland is using cairo_select_font_face() along with pango_layout_set_font_description() to render the fonts, the first one from cairo doesn't support such font glyphs fallback, and pango does, so for my case, the overlay message is all blocks.

It might be better to render only with pango for the project, rather than using both.

If you're willing, I may make the changes and create a PR later

[vaxerski]

feel free to mr, always welcome