Corporation news that should be in the Letterbox 1.03b9b

[ydmatrix2]

Corporation news that concern my own leaders (relation change, granting feats like "Corporate Shareholder") should also appear in the letterbox.

Otherwise, to currently know what's happening that applies to my leaders I need to check not only letterbox (every turn) but also the corporation overview (and cults and sects overview, for same reason).