Refactor everything that needs to arrange windows

* The arrange_foo functions are now replaced with arrange_and_commit, or
with manually created transactions and arrange_windows x2.
* The arrange functions are now only called from the highest level
functions rather than from both high level and low level functions.
* Due to the previous point, view_set_fullscreen_raw and
view_set_fullscreen are both merged into one function again.
* Floating and fullscreen are now working with transactions.

include/sway/desktop/transaction.h

@@ -16,12 +16,7 @@
  * the updates all at the same time.
  */
 
-struct sway_transaction {
-	struct wl_event_source *timer;
-	list_t *instructions;   // struct sway_transaction_instruction *
-	list_t *damage;         // struct wlr_box *
-	size_t num_waiting;
-};
+struct sway_transaction;
 
 /**
  * Create a new transaction.

include/sway/tree/arrange.h

@@ -23,11 +23,4 @@ void arrange_windows(struct sway_container *container,
  */
 void arrange_and_commit(struct sway_container *container);
 
-// These functions are temporary and are only here to make everything compile.
-// They are wrappers around arrange_and_commit.
-void arrange_root(void);
-void arrange_output(struct sway_container *container);
-void arrange_workspace(struct sway_container *container);
-void arrange_children_of(struct sway_container *container);
-
 #endif

include/sway/tree/view.h

@@ -214,6 +214,11 @@ const char *view_get_shell(struct sway_view *view);
 uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
 	int height);
 
+/**
+ * Center the view in its workspace and build the swayc decorations around it.
+ */
+void view_init_floating(struct sway_view *view);
+
 /**
  * Configure the view's position and size based on the swayc's position and
  * size, taking borders into consideration.