Add "focus_wrapping" option

Fixes #2352.

src/config.c

@@ -227,6 +227,8 @@ void load_configuration(xcb_connection_t *conn, const char *override_configpath,
     if (config.workspace_urgency_timer == 0)
         config.workspace_urgency_timer = 0.5;
 
+    config.focus_wrapping = true;
+
     parse_configuration(override_configpath, true);
 
     if (reload) {

src/config_directives.c

@@ -264,6 +264,10 @@ CFGFUN(disable_randr15, const char *value) {
     config.disable_randr15 = eval_boolstr(value);
 }
 
+CFGFUN(focus_wrapping, const char *value) {
+    config.focus_wrapping = eval_boolstr(value);
+}
+
 CFGFUN(force_focus_wrapping, const char *value) {
     config.force_focus_wrapping = eval_boolstr(value);
 }

src/tree.c

@@ -675,7 +675,7 @@ static bool _tree_next(Con *con, char way, orientation_t orientation, bool wrap)
  *
  */
 void tree_next(char way, orientation_t orientation) {
-    _tree_next(focused, way, orientation, true);
+    _tree_next(focused, way, orientation, config.focus_wrapping);
 }
 
 /*