* Added EnumInfoAttribute class to specify extra attributes for enums
* Added EnumInfoAttribute.Text attributes to AttachmentPoint enum
* Added Utils.EnumToText() that will return EnumInfoAttribute.Text for a given enum value
* Added Utils.StringToAttachmentPoint() that converts AttachmentPoint string returned in LLSD to AttachmentPoint enum
git-svn-id: http://libopenmetaverse.googlecode.com/svn/libopenmetaverse/trunk@3292 52acb1d6-8a22-11de-b505-999d5b087335
