Sacre bleu! Aux armes, cineastes!Maïwenn, the French actor-director, is being sued by a magazine editor for allegedly assaulting him–in a Paris restaurant, no less. In March, Edwy Plenel, the editor of Mediapart magazine, complained to the gendarmes that on February 22, Maïwenn grabbed him by the hair and spat in his face while he was…