Bug/csgrammar macro returns object not expr

[ReubenJ]

Previously, the @csgrammar macro called expr2csgrammar(...) at macro expansion time instead of returning an expression that included a call to expr2csgrammar(...). This made it impossible for debuggers to stop on breakpoints inside calls to the macro because those breakpoints were being hit at macro expansion time, not runtime.

The functionality is unchanged, but the debugging experience is improved, and the macro now follows a more Julian pattern for macros: simply taking an expression and returning an expression.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.10%. Comparing base (aca61f9) to head (04c2f4e).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #75   +/-   ##
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  Coverage   46.10%   46.10%           
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  Files           8        8           
  Lines         462      462           
=======================================
  Hits          213      213           
  Misses        249      249           

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