[gjs/wip/ptomato/mozjs31prep] (10 commits) ...object: Root misc functions

[Philip Chimento <pchimento src gnome org>]

Summary of changes:

  37212f7... marshalling tests: Add tests for GHashTable (*)
  c631351... arg: Use JS_Enumerate to find hash table props (*)
  de5dd65... arg: Set hash functions according to GI type (*)
  f57da29... arg: Don't convert GHashTable keys via GIArgument (*)
  27feb41... console: Check script args for stray GJS args (*)
  a8887e3... console: Env vars for coverage args (*)
  28bbd24... arg: Allocate hash values that don't fit in pointers (*)
  c82cf4d... arg: Update rooting to match mozjs31 (*)
  887b651... object: Use JS::Heap for GObject-JSObject weak ref
  77d5e5d... object: Root misc functions

(*) This commit already existed in another branch; no separate mail sent