Enum om\ICal\Value\Transparency

`implements`	`BackedEnum`

TRANSP values (RFC 5545, section 3.8.2.7): OPAQUE blocks time (busy), TRANSPARENT does not (free).

Located at ICal/Value/Transparency.php

Cases
`Opaque = 'OPAQUE'`	#
`Transparent = 'TRANSPARENT'`	#