pick now accepts lookup tables, with alternate cycle squeezing behaviour as new inhabit function (#918)

- the args for `pick` are now reversed (breaking change!)
- `pick` is also now a method on the inhabited pattern
- `pick` now also accepts a lookup table
- `inhabit` added with same behaviour as `pick`, except cycles from source patterns are squeezed into events of inhabited patterns
- Also some general doc tidying, sorry for the noise..
- There is now also `pickmod` and `inhabitmod`, for wrapping indexes around rather than clamping them

packages/core/util.mjs

@@ -316,3 +316,10 @@ export function hash2code(hash) {
   return base64ToUnicode(decodeURIComponent(hash));
   //return atob(decodeURIComponent(codeParam || ''));
 }
+
+export function objectMap(obj, fn) {
+  if (Array.isArray(obj)) {
+    return obj.map(fn);
+  }
+  return Object.fromEntries(Object.entries(obj).map(([k, v], i) => [k, fn(v, k, i)]));
+}