State that future touch IDs are indeterminatemultitouch

This just makes it absolutely clear that clients should not make any
assumptions about future touch ID values.

I also added "strictly monotonically" increasing to the definition of
touch IDs. It's a more precise definition of the protocol.

Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Chase Douglas <chase.douglas@canonical.com>

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