fix(parser)!: Split Parser::into into Parser::output_into and Parser::err_into

[epage]

Bringing in the Parser trait prevents using Into::into and
Parser::into as postfix. One way to fix this is to rename
Parser::into but the only idea I had for doing so was to split it
which I think makes more sense.

[coveralls]

Pull Request Test Coverage Report for Build 3750289026

• 3 of 11 (27.27%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 57.86%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/parser.rs	2	3	66.67%
src/combinator/mod.rs	1	8	12.5%

Files with Coverage Reduction	New Missed Lines	%
src/character/complete.rs	1	78.87%

Totals
Change from base Build 3733108228:	-0.2%
Covered Lines:	1833
Relevant Lines:	3168

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💛 - Coveralls