[Calc Functions] Substantially refactor calculation parsing (#3661)

This allows calculation syntax to coexist with user-defined Sass functions instead of needing every new calculation function to break all existing Sass functions of the same name. See #3504
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diff --git a/accepted/calc-functions.changes.md b/accepted/calc-functions.changes.md
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+## Draft 3.0
+
+* Refactor the way calculations are parsed to allow them to coexist with
+  user-defined Sass functions of the same names.
+
+* No longer forbid user-defined functions with the same names as CSS math
+  functions and remove the associated deprecation process.
+
+* Drop support for interpolation in calculations outside of identifier position
+  and add a deprecation process for this.
+
 ## Draft 2.1
 
 * Allow custom functions named like vendor-prefixed new CSS functions.