Adds Art. VI to Ch. 20.37; amends §§ 16.20.090, 20.00.030, 20.00.100, 20.00.160, 20.00.200, 20.00.210, 20.06.030(B), 20.08.020, 20.12.010(B) and (D), 20.13.080(B), 20.16.020, Figure 20.25.020(B), §§ 20.25.040, 20.34.030, 20.34.050(B) and (D)(3), 20.36.040(F), 20.36.110(C) and 20.37.020; repeals §§ 20.12.040(A)(6)(d), 20.25.050, 20.34.020(E), 20.34.100(D), 20.36.030(A)(17) and Figure 20.36.070(E); repeals BMC Appendix 20-B and replaces with Ch. 20.25 Exh. A; adopts downtown Bellingham plan; amends comprehensive plan, plans and land use maps for Lettered Streets, Sehome, Sunnyland and York neighborhoods; repeals city center master plan; repeals CBD neighborhood plan and replaces with city center neighborhood plan, zoning