After 50 Cent's ex, Shaniqua Tompkins, accused him publicly of burning down the home he owned that her and their son were living in -- she followed up with a restraining order. 50 may have had to surrender any guns he's been toting around as a part of the ruling, but the rapper then responded with his own legal papers...a $20 million defamation suit against Tompkins. It's been about one week since they were last......