Preserve file structure through initial check

Insert $file_start and $file_end pragmas in the AST, as well as
$include_start and $include_end pragmas so we can reconstruct the
original file structure later if needed, provided nothing like
topological sorting has been done.

Have the Lexer produce a list of comments whenever it parses a file,
which can the be attached to the nearest nodes in the abstract syntax
tree.

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