lamdera backend --eval improvements

[pithub]

Improvements to the lamdera backend --eval command:

• Greatly improved --import parser. Examples for allowed syntax:

  • --import 'Dict'
  • --import 'Dict as D'
  • --import 'Dict as D exposing (size)'
  • --import 'Dict, Set as S exposing (empty)'
  • --import 'Dict / Set / Task / '

  The previous syntax is still allowed, too:

  • --import 'import Dict'

• The exit code of the lamdera backend --eval command indicates whether the expression was successfully evaluated or not.