Support for runtime metaprogramming #121
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A few more nitpicks below, but eagerly approving - thanks!
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Adds support for formatting runtime quotations and splices to ocamlformat.
The appropriate changes are added to the lexing, parsing, and formatting.
At the level of individual files, runtime metaprogramming can be enabled or disabled using a syntax directive:
#syntax quotations [on|off]. This requires that we add such directives as a construct that does not lead to an error in the lexer; in fact, it has to get propagated through the parser and the formatter. These lexer directives are represented using the newlexer_directivetype.