add doubletap2wake, completely rewritten on the s2w template

This is as easy to port as s2w, if not easier since no touchscreen
coords are necessary for it to work.

Just throw it in your tree, force the touchscreen to stay online and
you are done.

Signed-off-by: Dennis Rassmann <showp1984@gmail.com> (reverted from commit 9c6543c6a6ced3144ab8683aca098e07d11ec636)