Diacetylene-Containing Polymers VII. Synthesis and Characterization of New Diacetylene-Containing Polyesters and Copolyesters Derived from Dipropargyl-1,10-decanate, Dipropargyl Terephthalate, 4,4′-Dipropargyloxy Diphenyl, and 4,4′-Bis[(5-carbopropargyloxy)pentoxy] diphenyl