version 1.2.0

Ancient WM support (-w 3 option).
Test and adapt for many WMs.
Disable: other desktops, title, decorations, appearance in taskbar.
Get rid of shell name expansions (wordexp.h).
Windows focus in Metacity and Xfce.
Work in partially EWMH-compatible WM.
Centering the switcher via WM hints.
Build with musl libc (Alpine Linux).
Avoid including "panel" and other auxiliary windows.