New command to scroll mouse wheel continuously

This is very similar to the
`<direction> <time_in_seconds>`
except that in most editing programs it doesn't move the cursor.

castervoice/rules/core/navigation_rules/nav2.py

@@ -53,6 +53,11 @@ class NavigationNon(MappingRule):
             R(Function(navigation.curse)),
         "scree <direction> [<nnavi500>]":
             R(Function(navigation.wheel_scroll)),
+        "zinc <direction> <time_in_seconds>":
+            R(AsynchronousAction(
+                [L(S(["cancel"], Function(navigation.wheel_scroll, nnavi500=1)))],
+                repetitions=1000,
+                blocking=False)),
         "colic":
             R(Key("control:down") + Mouse("left") + Key("control:up")),
         "garb [<nnavi500>]":

docs/readthedocs/Caster_Commands/Mouse.md

@@ -24,6 +24,9 @@ A video demonstration of mouse commands is found [here](https://youtu.be/UISjQBM
     - `<direction>` can be _sauce_ (up), _dunce_ (down), _lease_ (left), or _ross_ (right).
 - Scroll mouse wheel: `scree <direction> [number_of_scrolls]`
     - `<direction>` can be _sauce_ (up) or _dunce_ (down).
+- Scroll mouse wheel continuously (until you say `cancel`): `zinc <direction> <scroll speed>`
+    - `<direction>` can be _sauce_ (up) or _dunce_ (down).
+    - `<scroll speed>` can be _super slow_, _slow_, _normal_, or _supefast_
 
 **Examples**: