Speak AT-SPI2 on the accessibility bus from the display, over Vega's own D-Bus

vega display --access joins the accessibility bus as AT-SPI2 objects for
screen readers such as Orca, with no toolkit, ATK or libdbus: dbus.c
speaks the D-Bus wire format (EXTERNAL authentication, headers, aligned
bodies, calls, replies, signals). The tree follows what the say surface
says: a heading, a label per field, a list box per list whose items know
their place and which is selected and focused, tables, the entry, the
keys as buttons; answers come from the app when asked, one object has the
focus, and focus moves are said as events. Assistive technology can act
too: Selection focuses a row, Action presses a key. The live loop now
draws only when something changed, so a screen reader's questions no
longer cost frames. The check walks the tree with gdbus on a private
session bus with at-spi-bus-launcher, and follows the focus through keys,
Selection, Action and the events.

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