stdlib: Implement `reason` key for error_info
stdlib: Implement `reason` key for error_info

Add so that the `reason` key if returned from format_error/2
is used to print the reason for the error when pretty printing.

Add so that also functions without arguments call format_error/2.

Both of these changes are there in order to integrate better
with the way that Elixir does error handling.

isvilen/otp,vinoski/otp,uabboli/otp,emacsmirror/erlang,ferd/otp,dumbbell/otp,uabboli/otp,rlipscombe/otp,dumbbell/otp,bjorng/otp,rlipscombe/otp,getong/otp,emacsmirror/erlang,g-andrade/otp,getong/otp,jj1bdx/otp,jj1bdx/otp,uabboli/otp,ferd/otp,bjorng/otp,getong/otp,vinoski/otp,rlipscombe/otp,g-andrade/otp,ferd/otp,emacsmirror/erlang,bjorng/otp,bjorng/otp,emacsmirror/erlang,bjorng/otp,erlang/otp,ferd/otp,mikpe/otp,potatosalad/otp,emacsmirror/erlang,erlang/otp,emacsmirror/erlang,getong/otp,potatosalad/otp,dumbbell/otp,dgud/otp,dgud/otp,vinoski/otp,mikpe/otp,mikpe/otp,g-andrade/otp,dgud/otp,rlipscombe/otp,emacsmirror/erlang,dumbbell/otp,jj1bdx/otp,uabboli/otp,erlang/otp,ferd/otp,isvilen/otp,rlipscombe/otp,ferd/otp,vinoski/otp,dgud/otp,vinoski/otp,getong/otp,isvilen/otp,dgud/otp,dumbbell/otp,potatosalad/otp,uabboli/otp,potatosalad/otp,getong/otp,g-andrade/otp,dgud/otp,dgud/otp,ferd/otp,emacsmirror/erlang,rlipscombe/otp,mikpe/otp,mikpe/otp,rlipscombe/otp,dgud/otp,vinoski/otp,potatosalad/otp,jj1bdx/otp,rlipscombe/otp,g-andrade/otp,ferd/otp,jj1bdx/otp,getong/otp,dumbbell/otp,dumbbell/otp,bjorng/otp,erlang/otp,dumbbell/otp,rlipscombe/otp,getong/otp,g-andrade/otp,uabboli/otp,getong/otp,g-andrade/otp,dumbbell/otp,jj1bdx/otp,mikpe/otp,dgud/otp,g-andrade/otp,potatosalad/otp,erlang/otp,erlang/otp,mikpe/otp,erlang/otp,dgud/otp,vinoski/otp,g-andrade/otp,mikpe/otp,dumbbell/otp,jj1bdx/otp,getong/otp,uabboli/otp,mikpe/otp,vinoski/otp,vinoski/otp,bjorng/otp,uabboli/otp,g-andrade/otp,isvilen/otp,potatosalad/otp,isvilen/otp,erlang/otp,jj1bdx/otp,isvilen/otp,potatosalad/otp,vinoski/otp,jj1bdx/otp,isvilen/otp,bjorng/otp,mikpe/otp,ferd/otp,emacsmirror/erlang,jj1bdx/otp,potatosalad/otp,erlang/otp,erlang/otp,rlipscombe/otp,bjorng/otp,emacsmirror/erlang,isvilen/otp,isvilen/otp,uabboli/otp,potatosalad/otp,bjorng/otp,isvilen/otp