crash dump overlay

[markusfeyh]

I am noticing that we are required to define a crash dump overlay, otherwise this issue will occur:
#3 (comment)

{mapping, "erlang.crash_dump", "vm_args.-env ERL_CRASH_DUMP", [                
  {default, "erl_crash.dump"},                                                               
  {datatype, file},                                                            
  hidden                                                                       
]}.    

Ideally, this is something that users of the plugin should not have to worry about, so maybe we can define a default version in the plugin and then allow the user to override.