Allow multiple lines in one REPL

[Larsouille25]

The purpose of this issue was to enable multiple line in one "query" and the goal was achieved.

Before merge :

• [x] Fix the issue #11, when there is a IllegalCharError, the error doesn't point to the correct char,

  $ mona
  Mona v0.1.0-alpha, to exit enter `.quit` and to finish a query just enter `.eof`.
  You're in a debug binary, if it's not intentional, you should change.
  Flags: Lexer,Parser,
  ~> a
  > @
  > .eof
  Err: Lexer, in file `<stdin>` at line 1 :
  ... |
  1  | a
  ... |   ^
       Illegal Character
  ~> 

  should look like that,

  $ mona
  Mona v0.1.0-alpha, to exit enter `.quit` and to finish a query just enter `.eof`.
  You're in a debug binary, if it's not intentional, you should change.
  Flags: Lexer,Parser,
  ~> a
  > @
  > .eof
  Err: Lexer, in file `<stdin>` at line 1 :
  ... |
  2  | @
  ... | ^
     Illegal Character
  ~>