• improve error message quality
  • show the location where the parser fails for many cases (@xaxousis)
  • show both elements and the starting point of an array when the types of the elements are mixed
  • show the correct region for tables that are implicitly defined by dotted keys
• fix parser to allow empty files
• fix parser to allow the case in which implicit table definition appears before the table definition
• fix parser to disallow key-value pair after table definition, without newlines
• fix lexical analyzer to disallow invalid escape sequences
• fix parser to diagnose invalid utf-8 sequence