[dmd-internals] Preparations for DDMD

[Jacob Carlborg via dmd-internals]

I know there's been quite a lot of manual changes to make DDMD work. I would like to make sure my D/Objective-C branch is up to date with these changes. In general, what changes are needed? I know I'm quite far behind (for the new code), i.e. it still uses "struct" instead of the "class" keyword.

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/Jacob Carlborg