Skip generation of ignored enum items in `CodeGenerator`.
Skip generation of ignored enum items in `CodeGenerator`.

ddobrev/CppSharp,mono/CppSharp,ddobrev/CppSharp,zillemarco/CppSharp,mono/CppSharp,mono/CppSharp,ddobrev/CppSharp,zillemarco/CppSharp,ddobrev/CppSharp,mono/CppSharp,mono/CppSharp,mono/CppSharp,zillemarco/CppSharp,ddobrev/CppSharp,zillemarco/CppSharp,zillemarco/CppSharp