autofree: free global map consts and some vweb fixes

vlib/net/http/header.v

@@ -325,6 +325,12 @@ mut:
 	data map[string][]string
 }
 
+pub fn (mut h Header) free() {
+	unsafe {
+		h.data.free()
+	}
+}
+
 pub struct HeaderConfig {
 	key   CommonHeader
 	value string

vlib/v/gen/c/cgen.v

@@ -4642,12 +4642,16 @@ fn (mut g Gen) const_decl_init_later(mod string, name string, val string, typ ta
 		}
 	}
 	if g.is_autofree {
+		sym := g.table.get_type_symbol(typ)
 		if styp.starts_with('Array_') {
 			g.cleanups[mod].writeln('\tarray_free(&$cname);')
 		}
-		if styp == 'string' {
+		else if styp == 'string' {
 			g.cleanups[mod].writeln('\tstring_free(&$cname);')
 		}
+		else if sym.kind == .map {
+			g.cleanups[mod].writeln('\tmap_free(&$cname);')
+		}
 	}
 }
 

vlib/vweb/request.v

@@ -38,6 +38,7 @@ fn parse_request(mut reader io.BufferedReader) ?http.Request {
 			reader.read(mut body) or {}
 		}
 	}
+	h.free()
 
 	return http.Request{
 		method: method

vlib/vweb/vweb.v

@@ -298,6 +298,8 @@ pub fn run_app<T>(mut app T, port int) {
 	}
 }
 
+
+[manualfree]
 fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
 	conn.set_read_timeout(30 * time.second)
 	conn.set_write_timeout(30 * time.second)