st features not supported by wterm

[keithbowes]

• XIM support. Using the Compose key doesn't work at all, but it does in other terminal emulators I have installed (gnome-terminal, kitty, konsole, urxvt, weston-terminal). Maybe it has something to do with Wayland's input-method protocol.
• Mouse support. When I click on an area in Vim, Lynx, etc, it doesn't work. It does to some degree in Midnight Commander if I use the -x option. (Though, the good part about that is that selecting text in Vim actually places it in the clipboard as it should, so I don't have to use custom bindings around wl-copy and wl-paste.)
• Antialiased fonts. This will probably be solved by the potential font-rendering rewrite mentioned in issue Noto Sans Mono breaks rendering #8.
• Fallback fonts. Ditto.