cli: improved error handling for to_int64(), added to_double() (#82)
cli: improved error handling for to_int64(), added to_double() (#82)

* allow only 'f' as a valid postfix (removed 'd'), added logic to catch additional letters, eg 'fdx'

guibec/rpgcraft,guibec/rpgcraft,guibec/rpgcraft,guibec/rpgcraft