waylyrics 作为歌词显示窗口

[mokurin000]

Motivation

Compares to GTK+, Qt is lack of surface operation support

Also, we don't want to implement everything for every platforms,

Tweaking on random Qt flags is also a nightmare.

Thus, we could introduce waylyrics (which is based on GTK+ 4), for linux users.

which will make mouse pass through work on X11/Wayland.

In theory it supports windows, but connecting to session bus on Windows is lack of ecosystem support. Forget it.

Detail

supersede: #880
waylyrics 现在会监听 SetAboveLabel 和· SetBelowLabel 信号，

destination:

• io.github.waylyrics.Waylyrics (若不考虑多实例识别支持）
• io.github.waylyrics.Waylyrics[.*] (若考虑多实例识别支持）

object path:
/io/github/waylyrics/Waylyrics
interface:
io.github.waylyrics.Waylyrics
member:
SetAboveLabel / SetBelowLabel
signature:
s