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/commands/swap.c b/sway/commands/swap.c
index 4e3a9cce..615e6b1d 100644
--- a/sway/commands/swap.c
+++ b/sway/commands/swap.c
@@ -50,13 +50,13 @@ struct cmd_results *cmd_swap(int argc, char **argv) {
         if (strcasecmp(argv[2], "id") == 0) {
 #ifdef HAVE_XWAYLAND
                 xcb_window_t id = strtol(value, NULL, 0);
-                other = container_find(&root_container, test_id, (void *)&id);
+                other = root_find_container(test_id, (void *)&id);
 #endif
         } else if (strcasecmp(argv[2], "con_id") == 0) {
                 size_t con_id = atoi(value);
-                other = container_find(&root_container, test_con_id, (void *)con_id);
+                other = root_find_container(test_con_id, (void *)con_id);
         } else if (strcasecmp(argv[2], "mark") == 0) {
-                other = container_find(&root_container, test_mark, (void *)value);
+                other = root_find_container(test_mark, (void *)value);
         } else {
                 free(value);
                 return cmd_results_new(CMD_INVALID, "swap", EXPECTED_SYNTAX);