[gjs] (18 commits) Non-fast-forward update to branch wip/ptomato/mozjs38

[Philip Chimento <pchimento src gnome org>]

The branch 'wip/ptomato/mozjs38' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  06433f3... js: AutoValueVector's [] operator is rooted
  18db4d8... js: Adapt to new JS_NewObject() API
  2d9ddd2... js: Adapt to new JS_DefinePropertyById() API
  5b06576... js: Rename JS_CallHeapFooTracer()
  5121d42... js: Discontinue JSClass stubs
  68526c7... js: Adapt to new JS_SetErrorReporter() API
  7964ff1... constructor-proxy: Adapt to new js::DirectProxyHandler API
  38db158... runtime: Adapt to new JSFinalizeCallback
  6519f17... js: Adapt to new mozilla::Maybe API
  08be1f9... js: Adapt to new signature of resolve operation
  a769db6... js: Accommodate both Latin-1 and two-byte strings
  d7bf1c6... js: JSNative accessors in JS_DefineProperty()
  5973c8b... js: Fix misc APIs for mozjs38
  b70b3fa... js: Various SpiderMonkey 38 improvements
  3689797... WIP - weak pointers
  2cef79a... WIP - Switch to new JSClass.enumerate
  702303e... WIP - early define props

Commits added to the branch:

  48f662f... docs: Overview of new JS features in NEWS
  1c8acd6... js: AutoValueVector's [] operator is rooted
  9d44f82... js: Adapt to new JS_NewObject() API
  8b16813... js: Adapt to new JS_DefinePropertyById() API
  a7adb51... js: Rename JS_CallHeapFooTracer()
  45947c2... js: Discontinue JSClass stubs
  f97f3b3... js: Adapt to new JS_SetErrorReporter() API
  b4e27cc... constructor-proxy: Adapt to new js::DirectProxyHandler API
  0241ddc... runtime: Adapt to new JSFinalizeCallback
  5d3d3be... js: Adapt to new mozilla::Maybe API
  a0e6030... js: Adapt to new signature of resolve operation
  ea76929... js: Accommodate both Latin-1 and two-byte strings
  70f1d87... js: JSNative accessors in JS_DefineProperty()
  d5b548d... js: Fix misc APIs for mozjs38
  944a6a6... js: Various SpiderMonkey 38 improvements
  40f2112... WIP - weak pointers
  3b55d57... WIP - Switch to new JSClass.enumerate
  d4046c6... WIP - early define props