Reimplement compose and add tiling windows

core/templates/partials/workspace-widget-loader.html

@@ -0,0 +1,7 @@
+<div
+  hx-headers='{"X-CSRFToken": "{{ csrf_token }}"}'
+  hx-get="{{ widget_url }}"
+  hx-target="{% firstof target_selector '#widgets-here' %}"
+  hx-trigger="{% firstof trigger_name 'load' %}{% if trigger_delay %} delay:{{ trigger_delay }}{% endif %}"
+  hx-swap="{% firstof swap_strategy 'beforeend' %}"
+  style="display: none;"></div>