semantic: Don't null out aggregate field assigns until all ctors are handled.
semantic: Accept Scope and TryStatement in IR
volt: WIP Add EH support for some platforms
rt: Add assert false to dw_encoded_size default case.
rt: Enable DWARF exception handling on Windows.
semantic: First pass at operator overloading.
semantic: Overload classes and structs.
semantic: Separate operator names from extyper.
semantic: Neatness.
semantic: Add opNotEqual.
semantic: opIndex support.
semantic: Use function overloading rules to check operator overloads.