The 2013 BAM Next Wave Festival has announced its lineup and it's pretty great. Highlights include:SiderA work by William Forsythe and The Forsythe CompanyMusic by Thom WillemsFor choreographer William Forsythe, the stage is a large-scale laboratory for boundless theatrical and linguistic investigation. In Sider, the knotty speech rhythms of late-16th-century Elizabethan tragedy form the unlikely point of d…