Implement iterators per container type

This introduces the following `for_each` functions:

* root_for_each_workspace
* root_for_each_container
* output_for_each_workspace
* output_for_each_container
* workspace_for_each_container

And introduces the following `find` functions:

* root_find_output
* root_find_workspace
* root_find_container
* output_find_workspace
* output_find_container
* workspace_find_container
* container_find_child

And removes the following functions:

* container_descendants
* container_for_each_descendant
* container_find

This change is preparing the way for demoting sway_container. Eventually
these functions will accept and return sway_outputs, sway_workspaces and
sway_containers (meaning a C_CONTAINER or C_VIEW).

This change also makes it easy to handle abnormalities like the
workspace floating list, root's scratchpad list and (once implemented)
root's saved workspaces list for when there's no connected outputs.

1 files changed, 3 insertions, 3 deletions

diff --git a/sway/tree/view.c b/sway/tree/view.c
index 950494d8..4495c150 100644
--- a/sway/tree/view.c
+++ b/sway/tree/view.c
@@ -899,8 +899,8 @@ static bool find_by_mark_iterator(struct sway_container *con,
 }
 
 struct sway_view *view_find_mark(char *mark) {
-	struct sway_container *container = container_find(&root_container,
-		find_by_mark_iterator, mark);
+	struct sway_container *container = root_find_container(
+			find_by_mark_iterator, mark);
 	if (!container) {
 		return NULL;
 	}
@@ -908,7 +908,7 @@ struct sway_view *view_find_mark(char *mark) {
 }
 
 bool view_find_and_unmark(char *mark) {
-	struct sway_container *container = container_find(&root_container,
+	struct sway_container *container = root_find_container(
 		find_by_mark_iterator, mark);
 	if (!container) {
 		return false;