[gjs] (21 commits) Non-fast-forward update to branch mozjs78

[Evan Welsh <ewlsh src gnome org>]

The branch 'mozjs78' 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:

  dd1b785... Switch to maintained lint-condo image.
  b8e64a4... Update dangling comma eslint rule. - In ESLint v6, dangling
  5923bc8... Merge branch 'ewlsh/update-eslint' into 'master'
  de24d1b... function: Only get function name if we actually warn
  05745ab... Merge branch 'verdre/gjs-small-invoke-c-func-improvement'
  019ef2d... Initial stab at mozjs78.

Commits added to the branch:

  ccf259a... Switch to maintained lint-condo image.
  2a679e1... Update dangling comma eslint rule. - In ESLint v6, dangling
  9c70519... function: Only get function name if we actually warn
  7fb1f82... A super quick jasmine patch.
  65f1d4b... build: Update dependencies for mozjs78 and C++17
  c42e427... Refactor Array-related JSAPI calls. - Use <js/Array.h> for.
  75d0f81... Remove some forward declarations. - Forward declaring 'mozi
  5027f43... Disable unresolvable cache. - Causes tracing to break when 
  6e03b1f... Use JS::PropertyKey instead of removed macro. - 'INTERNED_S
  4a1234f... Replace FlatString(s) with LinearString.
  3dfed43... Remove GJS_DISABLE_EXTRA_WARNINGS. - Upstream has removed t
  bb300bb... engine: Update flags. - JSGC_MAX_MALLOC_BYTES was removed. 
  0ddac64... engine: Update hook signatures. - Unhandled promises now ha
  a2cd331... global: Update realm creation options. - setToSourceEnabled
  b520a17... Update coverage for signature changes. - 'js::GetCodeCovera
  6f592e3... JSPropertySpec flags are now private. - Comment out for now
  08c4dd7... Remove error report flags usage. - Removed from upstream.
  c58f2c0... Remove js::Jsvalify. - No longer needed and removed upstrea
  ebcd306... Refactor 'js::gc::detail::GetGCThingZone' - Is now 'js::gc:
  2e746d0... Adapt to new JS::PrintError API. - Remove code copied from 
  f845115... Update style guide for C++17.