do_after (#1616)

* do_after

Ports (most of) do_after from SS13.
Callers are expected to await the DoAfter task from the DoAfterSystem.
I had a dummy component for in-game testing which I removed for the PR so nothing in game uses do_after at the moment.
Currently only the movement cancellation is predicted client-side.

* Minor do_after doc cleanup

* do_the_shuffle

Fix nullable build errors.

* The last nullable

* Implement NeedHand

Thanks zum.

* nullable dereference

* Adjust the system query

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Resources/Textures/Interface/Misc/progress_bar.rsi/meta.json

@@ -0,0 +1,15 @@
+{
+    "version": 1,
+    "size": {
+        "x": 24,
+        "y": 7
+    },
+    "license": "CC-BY-SA-3.0",
+    "copyright": "https://github.com/tgstation/tgstation/blob/886ca0f8dddf83ecaf10c92ff106172722352192/icons/effects/progessbar.dmi",
+    "states": [
+        {
+            "name": "icon",
+            "directions": 1
+        }
+    ]
+}