Liverpool's new Everyman by Haworth Tompkins is a thoughtful, well-crafted space for theatre in which the play comes firstSusannah Clapp reviews Twelfth Night at the EverymanGallery: the new Liverpool Everyman " in picturesArchitecture and theatre are not easy in each other's company. Theatre involves illusion, fakery and artifice, and would rather have something painted to look like marble than the actual mineral. I…