Support calling conventions on anonymous / reference-to-function types

[civilian7]

Summary

AnonymousMethod / AnonymousMethodType did not consume a trailing calling-convention directive after the result type. The Delphi RTL uses this on reference to function types and inline anonymous methods:

• Winapi.EdgeUtils.pas: TCb<T> = reference to function(const P1: T): HResult stdcall;
• Vcl.Edge.pas: inline function(...): HResult stdcall begin ... end;

These currently fail with SemiColon / Begin expected found stdcall.

Change

Both AnonymousMethod and AnonymousMethodType now consume trailing calling-convention directives (cdecl / pascal / register / safecall / stdcall) via the existing ProceduralDirective rule.

Test

Added Test/Snippets/anonymousmethodcallingconvention.pas exercising reference to function(...): HRESULT stdcall and reference to procedure(...) cdecl.

Verified by parsing the full Delphi 13.1 RTL/VCL source: Winapi.EdgeUtils, Vcl.Edge, and FMX.WebBrowser.Win now parse cleanly (no new regressions across the 2455-unit corpus).