Charlie Hunsicker has been working for Manatee County — save for a three-year stint as assistant city manager in Clearwater — since Jimmy Carter’s first year as U.S. President. And it’s only a little bit of exaggeration to say Hunsicker’s been angling, in one form or another, for a trails system in Manatee County ever since then, in 1977. Hunsicker, 73, the county’s director of natural resources, is tantalizingly close to his trails dream coming…