FEAT: support for images in other terminals

[andrinoff]

Kitty image protocol is available in a few terminals, add support to non-kitty terminals too.

[nwtowers-matthew]

what environment variables need to be set for wezterm image support? I haven't had any success with TERM=kitty or SIXEL=1.

I can do SIXEL=1 in Windows Terminal but it doesn't display correctly.

Wezterm also says it supports the iterm2 inline protocol.