Move static files out of pretix again, compile on setuptools build

src/static/pretixcontrol/less/orders.less

@@ -0,0 +1,21 @@
+.table-product-overview {
+    .item.categorized td:first-child {
+        padding-left: 20px;
+    }
+    .variation td:first-child {
+        padding-left: 20px;
+    }
+    .variation.categorized td:first-child {
+        padding-left: 40px;
+    }
+    td:not(:first-child),
+    th:not(:first-child) {
+        text-align: right;
+    }
+    span.sum {
+        display: none;
+    }
+}
+#sumtoggle {
+    margin-top: 20px;
+}