Michael Stapelberg 9e3a9e8225
Allow text drawing to use the alpha channel. (#5246)
This is the last remaining diff from the i3-gaps tree.

related to https://github.com/i3/i3/issues/3724

Tested using the following config with picom:

bar {
	i3bar_command i3bar -t
	status_command i3status
	colors {
		# fully	transparent text on opaque background:
		statusline #ffffff00
		background #000000ff
	}
}
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Introduction
============

libi3 is an *INTERNAL* library which contains functions that i3 and related
tools (i3-msg, i3-input, i3-nagbar, i3-config-wizard, i3bar) use.

It is NOT to be used by other programs.

Structure
=========

Every function gets its own .c file, which in turn gets compiled into an .o
object file. Afterwards, all .o files are archived into one static library
(libi3.a). This library will be linked into all i3 binaries. The linker is able
to eliminate unused .o files when linking, so only the functions which you
actually use will be included in the corresponding binary.