* remove unofficial 'WPA2' enc. token for better compatibility with
certain QR code reader, still 'WPA', 'WEP' and 'nopass' are supported
* add WEP key slot support (not really needed, but it's still
supported by LuCI wireless)
* correct escape single quotes and other special chars
in SSID & passwords
* code cleanup
Signed-off-by: Dirk Brenken <dev@brenken.org>