specs: Tokenizertest

+ Test regarding the tokenizer

Signed-off-by: Max Reitz <xanclic@niwohlos.org>
Fix column index

! The column index is 1-based, just as the line index is

Signed-off-by: Max Reitz <xanclic@niwohlos.org>
Include line/column in tokenizer error

+ Include the line and column number in tokenizer error reports

Signed-off-by: Max Reitz <xanclic@niwohlos.org>