Reject invalid match criteria with an error.

Reject invalid match criteria with an error.

Previously, using a command like

  [con_id=foo] kill

would kill the currently focused window because while an error for
not being able to parse the con_id was logged, no further action
was taken, which caused the criterion to be ignored. In this case,
the fallback behavior of using the focused window took over.

For con_id, id and window_type we now reject incorrect values with
an error and abort the command.

fixes #2091