Add support for OSC 22

This allows setting a cursor shape, the names are X11 names which should be just
passed as is to winit. We may want to have an option to disable it.

The use case is to have a better mouse mode support in some applications.

The escape is supported by: foot, xterm. The docs are on https://invisible-island.net/xterm/ctlseqs/ctlseqs.html . If the shape doesn't exist we can ignore the event.