Improve set-cookie — add more supported values

[peace2000]

More values were added to uBO as accepted values gorhill/uBlock@d51b393. Can you add them to AG as well?

Added values were:
rejected
allowed
disallow
accepted
notaccepted
enable
enabled
disable
disabled

[slavaleleka]

support "on" and "off"

Used on praxisplan.at.

uBlockOrigin/uAssets@0cd4612

(Also made a proposal to add them to uBO as well)

originally reported in #366