Add 'log_hubchat' setting to disable logging of the main chat

Kinda annoying how this requires reopening the hub tab, but fixing that
is a bit ugly.

Author: Yorhel

src/doc.h

@@ -479,6 +479,10 @@ static const doc_set_t doc_sets[] = {
 { "log_downloads", 0, "<boolean>",
   "Log downloaded files to transfers.log."
 },
+{ "log_hubchat", 1, "<boolean>",
+  "Log the main hub chat. Note that changing this requires any affected hub"
+  " tabs to be closed and reopened before the change is effective."
+},
 { "log_uploads", 0, "<boolean>",
   "Log file uploads to transfers.log."
 },

src/uit_hub.c

@@ -70,7 +70,9 @@ ui_tab_t *uit_hub_create(const char *name, gboolean conn) {
   t->tab.name = g_strdup_printf("#%s", name);
   t->tab.type = uit_hub;
   t->tab.hub = hub_create((ui_tab_t *)t);
-  t->tab.log = ui_logwindow_create(t->tab.name, var_get_int(t->tab.hub->id, VAR_backlog));
+  t->tab.log = ui_logwindow_create(
+      var_get_bool(t->tab.hub->id, VAR_log_hubchat) ? t->tab.name : NULL,
+      var_get_int(t->tab.hub->id, VAR_backlog));
   t->tab.log->handle = t;
   t->tab.log->checkchat = uit_hub_log_checkchat;
 

src/vars.c

@@ -972,6 +972,7 @@ struct var_t {
   V(local_address,    1,1, f_id,           p_ip,            su_old,        NULL,         s_active_conf,   db_vars_get(0, "active_bind"))\
   V(log_debug,        1,0, f_bool,         p_bool,          su_bool,       NULL,         s_log_debug,     i_log_debug())\
   V(log_downloads,    1,0, f_bool,         p_bool,          su_bool,       NULL,         NULL,            "true")\
+  V(log_hubchat,      1,1, f_bool,         p_bool,          su_bool,       NULL,         NULL,            "true")\
   V(log_uploads,      1,0, f_bool,         p_bool,          su_bool,       NULL,         NULL,            "true")\
   V(minislots,        1,0, f_int,          p_int_ge1,       NULL,          NULL,         NULL,            "3")\
   V(minislot_size,    1,0, f_minislot_size,p_minislot_size, NULL,          NULL,         NULL,            "65536")\