To further improve Dexter's script writing ability, this patch starts
implementing the ability for Dexter to fetch all variables with in a
given "scope", as defined by the DAP "scopes" request. This allows the
test to collect all available variables without needing to specify them
explicitly in the script, aiding in fast script
generation/re-generation.
This patch does not add any script-writing functionality, but adds the
!value/all Node, which fetches all variable values from the given scope,
and enables fetching these values from DAP-based debuggers.
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