Freedom of Speech and Religious Expression in Public Schools; Prohibiting a school district from discriminating against students or school personnel on the basis of political or ideological viewpoints or expression; authorizing students to express political or ideological beliefs in coursework, artwork, and other specified assignments; authorizing a student to wear clothing, accessories, and jewelry displaying political or ideological messages or symbols; authorizing political or ideological groups to advertise or announce meetings in the same manner and to the same extent as other groups; creating a private cause of action for persons and student clubs or groups harmed by specified violations, etc.