Handling of snailcase tags in CommandGenerator.

Refactoring: move unify to helper class.

Parameter only now accepts non array values.

Parser parse_writing implemented. Parsing methods returns now self.

Parsing exiftool errors.

Eliminating Parser::Result.

Making Parser a class.

New method ReadObject#path.

Logger added.

Manifest updated.

Switching to wdiff with a self written colorizer for regression diffs.

Using -overwrite_original as standard option when writing.

Improving test texts.

Parenthesis warning fixed.

Regression data included.