move tree includes to their own directory

include/sway/tree/layout.h

@@ -0,0 +1,51 @@
+#ifndef _SWAY_LAYOUT_H
+#define _SWAY_LAYOUT_H
+
+#include <wlr/types/wlr_output_layout.h>
+#include "sway/tree/container.h"
+
+enum movement_direction {
+	MOVE_LEFT,
+	MOVE_RIGHT,
+	MOVE_UP,
+	MOVE_DOWN,
+	MOVE_PARENT,
+	MOVE_CHILD,
+	MOVE_NEXT,
+	MOVE_PREV,
+	MOVE_FIRST
+};
+
+struct sway_container;
+
+struct sway_root {
+	struct wlr_output_layout *output_layout;
+
+	struct wl_listener output_layout_change;
+
+	struct wl_list unmanaged_views; // sway_view::unmanaged_view_link
+
+	struct {
+		struct wl_signal new_container;
+	} events;
+};
+
+void init_layout(void);
+
+void add_child(struct sway_container *parent, struct sway_container *child);
+
+swayc_t *add_sibling(swayc_t *parent, swayc_t *child);
+
+struct sway_container *remove_child(struct sway_container *child);
+
+enum swayc_layouts default_layout(struct sway_container *output);
+
+void sort_workspaces(struct sway_container *output);
+
+void arrange_windows(struct sway_container *container,
+		double width, double height);
+
+swayc_t *get_swayc_in_direction(swayc_t *container,
+		struct sway_seat *seat, enum movement_direction dir);
+
+#endif