Addresses two issues:
- keep the parens from dbg!() in case the call is chained or there is
semantic difference if parens are excluded
- Exclude the semicolon after the dbg!(); by checking if it was
accidentally included in the macro_call
investigated, but decided against:
fix ast::MacroCall extraction to never include semicolons at the end -
this logic lives in rowan.
Defensively shorten the macro_range if there is a semicolon token.
Deleted unneccessary temp variable macro_args
Renamed macro_content to "paste_instead_of_dbg", because it isn't a
simple extraction of text inside dbg!() anymore
