Route GameHandler's raid mark getters to SocialHandler, which is where
MSG_RAID_TARGET_UPDATE stores marks — GameHandler kept a second array that
nothing ever wrote, so the target frame, nameplates, minimap and social
panel all read zeros. Fix the parse to match the wire format as well: the
full list carries only the icons that are set rather than a fixed eight,
and a single mark leads with the setter's GUID on WotLK but not on
classic/TBC, told apart by remaining size so every expansion decodes.
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