a13: add pov tab p703 tablet

Aka Q8.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
a13: add forfun q88db tablet

Signed-off-by: Luc Verhaegen <libv@skynet.be>
a20: sanitize merrii hummingbird a20 fex

Signed-off-by: Luc Verhaegen <libv@skynet.be>