Gene Maddaus Senior Media Writer TSG Entertainment, which has invested more than $3 billion in 140 Fox films including “Avatar: The Way of Water” and “The Shape of Water,” accused Disney in a lawsuit on Tuesday of using Hollywood accounting tricks to cheat it out of hundreds of millions of dollars. The slate financier alleged that Disney had engaged in “self-dealing” by diverting Fox films from a lucrative HBO license to its own Disney+ and Hulu platforms. The lawsuit also alleges that Fox engaged in “sweetheart” deals when it licensed its films to the FX cable channel.