[gjs] (9 commits) ...Merge branch 'arg-cache-cpp-1' into 'master'

[Philip Chimento <pchimento src gnome org>]

Summary of changes:

  bfda156... arg-cache: Rewrite it taking advantage of C++ features
  e7212c6... arg: Pass GjsArgumentFlags to all the functions and handle 
  2eb740d... arg-cache: Remove arg position from generic argument
  5583be8... arg-cache: Create Return and Instance arguments only if we 
  7bcdf92... arg-cache: Move generic out in function to Positioned, simp
  064da40... arg-cache: Only use one structure for fallback interface ty
  3eae941... arg-cache: Save GType information for RegisteredType
  3cd992b... arg-cache: Only store GType and InfoType in RegisteredType'
  4aba157... Merge branch 'arg-cache-cpp-1' into 'master'