Municipal corporations — Code enforcement — Nonconforming use — Boat docking — Board of code enforcement erred in fining landowner for docking boat that exceeded maximum size permitted under current town code enacted in 2011 where owner has docked boats on his property that exceeded or would have exceeded maximum size permitted under current code since 1996 and is permitted to continue nonconforming use — Board erred in finding that landowner abandoned or discontinued nonconforming use when his boat was stored offsite during protracted insurance claim after it was stolen and vandalized where board never made finding that discontinued use/abandonment was voluntary