[PATCH 0 of 2] highlight: encode to hgweb.encoding to avoid tracebacks

[Christian Ebert]

First patch replaces unnecessary keyword arguments.

Second patch tries to make a consistent approach at avoiding
tracebacks due to UnicodeDecodeError:

- We need to pass encoding parameters to pygments lexers and
  formatter.
- We set util._encoding to hgweb.encoding to avoid conflicts
  between input and output encoding.
- To ensure that the lexer can digest its input, we encode the
  input with util.tolocal.

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