view: try to reduce confusion in focused_view tracking

Our current approach to handling the focused/active view is a bit
confusing. In particular, it's hard to be sure when server->focused_view
is or isn't in sync with the real wlroots keyboard focus.

Try to clean things up a bit. In particular:

- Add comments to server->focused_view and desktop_focused_view() to
  clarify that they should match, but it's not guaranteed.

- desktop_focused_view() now prints a warning if it detects that
  server->focused_view is out of sync. We should keep an eye out for
  this warning, and if we see it, try to figure out why it happened.

- For consistency, use only "focus/defocus" as the verbs in function
  names rather than "activate". This is a bit arbitrary, but the idea is
  that focus is the primary action while the active/inactive state is a
  side effect.

- view_focus/defocus() replace view_set_activated() and now update both
  focus and active/inactive state, to try to keep them in sync.

- Add comments at view_focus/defocus() to warn against calling them
  directly (we should generally call the desktop.c functions).

- desktop_focus_view(NULL) is now forbidden and is no longer handled as
  a special case to clear the focus. This was (at least to me) a
  surprising behavior and caused trouble when working on another change.

- To maintain existing behavior, desktop_focus_topmost_mapped_view() now
  explicitly clears the focus if there are no mapped views.

There should be no behavioral change here.

src/cursor.c

@@ -478,7 +478,7 @@ process_cursor_motion(struct server *server, uint32_t time)
 	}
 
 	if (ctx.view && rc.focus_follow_mouse) {
-		desktop_focus_and_activate_view(seat, ctx.view);
+		desktop_focus_view(ctx.view);
 		if (rc.raise_on_focus) {
 			view_move_to_front(ctx.view);
 		}
@@ -522,7 +522,7 @@ _cursor_update_focus(struct server *server)
 			&& !rc.focus_follow_mouse_requires_movement
 			&& !server->osd_state.cycle_view) {
 		/* Prevents changing keyboard focus during A-Tab */
-		desktop_focus_and_activate_view(&server->seat, ctx.view);
+		desktop_focus_view(ctx.view);
 		if (rc.raise_on_focus) {
 			view_move_to_front(ctx.view);
 		}