Devices: Add pointing stick

[wpkelso]

Rel elementary/settings-mouse-touchpad#263

[wpkelso]

@danirabbit Here's the only file I have so far. I don't know if we'll run into image issues with it being very directly a TrackPoint.

[danirabbit]

This should be proposed into the pointing stick branch, not icons since it's a non-fdo icon name :)

[wpkelso]

This should be proposed into the pointing stick branch, not icons since it's a non-fdo icon name :)

😅 Oops, I'll figure that out. I tried doing it earlier and GitHub was unhappy with my permissions for the repo.

[danirabbit]

Actually I might try something different. I'm not sure about this front on angle since it doesn't fill the canvas very well

[tintou]

We should ask for inclusion in the fdo spec

[danirabbit]

@tintou we would have to provide examples of it being used across desktops. There's a lot of aversion to expanding the spec

[danirabbit]

Gonna close this since we gresourced the icon in settings. We can always revisit if it turns out we're using pointing stick icons in multiple places or the icon spec changes