Fix 'calling clear method' when defined in pry context. #2291
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When scanning code for syntax highlighting, a method 'clear' was called if defined on self.
I narrowed down the issue to being related to this part https://github.com/rubychan/coderay/blob/f71b25d3112ac7fcc43ca48055030319ecc7a840/lib/coderay/encoders/encoder.rb#L72
I changed the way we call CodeRay instead. As a part of this change, I also removed pre-coderay 1.0 code.
Fixes #1610