Round 7: variable template specialization, local struct emit, pack expansion

Parser:
- Variable template specialization: zero<float> = 0.0f consumed in parseFunctionOrVariableName
- Local struct definition: emitted via CodeGen.generateNode including Point type
- Args&&... variadic params: isVariadic tracked from type-level pack expansion
- args... in call args: PostfixExpr wraps pack-expanded arguments

CodeGen/CppBuild:
- LambdaExpr.isMutable: emitted after params, before ->
- FunctionDecl = default / = delete: properly set and emitted
- TopLevelStatements hoisted to namespace scope
- Explicit template instantiations emitted before namespace Processing
- Trailing return type decltype(...): auto name(params) -> decltype(...)

Author: pepc84

mode/CppMode.jar

@@ -1322,6 +1322,21 @@ private String parseFunctionOrVariableName() {
             advance();
             name += "::" + expectIdentifier().text();
         }
+        // Variable template specialization: "zero<float>" -- consume <args>
+        if (checkOp("<") && looksLikeTemplateArgList()) {
+            StringBuilder sb = new StringBuilder(name);
+            sb.append("<");
+            advance(); // consume <
+            int depth = 1;
+            while (!isAtEnd() && depth > 0) {
+                if (checkOp("<")) { depth++; sb.append(advance().text()); }
+                else if (checkOp(">")) { depth--; if (depth > 0) sb.append(advance().text()); else advance(); }
+                else if (checkOp(">>")) { depth -= 2; splitTrailingShiftIntoTwoCloseAngles(); if (depth > 0) sb.append(advance().text()); else advance(); }
+                else sb.append(advance().text());
+            }
+            sb.append(">");
+            name = sb.toString();
+        }
         return name;
     }