20210715a

• Incrementally compile a new C++ item after >fix adds it.
• Recompile a function definition after >fix changes its implementation.
• Fix bug: delay invoking RecordAccess on a function until argument matching selects the correct overload; this fixes incorrect ItemCouldBePrivate and ItemCouldBeProtected warnings.
• Fix bug: enforce internal linkage for an item tagged static at .cpp file scope.
• Generate a DataShouldBeStatic warning for data at .cpp file scope that is not static if it is not declared as extern elsewhere.
• Fix bug: invoke RecordAccess on the copy constructor when returning an object by value to prevent a false ItemCouldBeProtected warning for the copy constructor.
• Fix bug: Typedef.GetSpan only included the name, not the leading typedef <TypeSpec> portion.
• Fix bug: when changing an item's access control, >fix could move it to an inner class.