wshaper: import from packages

Import the current wshaper package and add myself as maintainer.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
wshaper: minor fixes

Adjust package version and release to reflect upstream compatibility,
replace deprecated uci_get_state with network_get_device.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>