woodruffw/x_do.cr

Adds `Window#==` for window comparison, makes `Window#parent`
and `Window#child` return full `Window` instances instead of just
X11 WIDs.

All `LibXDo` calls now return `LibXDo::Status`es, which should make
error handling a lot simpler.

My something about my graphics setup makes XOrg very unhappy
with 8-bit deep screens.

This eliminates the need for the user to call `xdo.free!`
on their XDo object once finished with it.

Disable desktop spec for now.

The `display` field in an `XDo` instance is now populated by
default from `ENV["DISPLAY"]`, which can be `nil`. This means that
`display` itself can potentially be `nil`.

This commit also fixes the `XDo#focused_window` method, which was
broken because `out` cannot be used on the same variable more than
once.

Still nothing here, but make it pass anyways.