Move everything under package dcd

[LaurentTreguier]

This PR just moves every module from foo to dcd.foo. As DCD can be used as a library, importing something with a generic name like server.foo isn't optimal to avoid name clashes. Making everything start with dcd. (like dfmt already does) would seem a lot more natural.

Now obviously, if this change was pulled, it would break absolutely every single package currently using DCD as a library, and thus would require at least a new minor version; but it's not like it would be very hard to adapt to this change.

[rikkimax]

It needs to be moved under a dcd directory for importing. Otherwise dmd won't be able to see it quite right.

So:

• src/dcd/server/main.d

[rikkimax]

@Hackerpilot if you're happy with this resonably small refactor, I'll turn on auto-merge-squash when these other issues are dealt with.

[LaurentTreguier]

Technically it does compile without packages corresponding to directories... However DCD completion stops working (how ironic). I'll do the change later today when I have access to my PC

[Hackerpilot]

However DCD completion stops working (how ironic).

The language specification says

The packages correspond to directory names in the source file path.

I don't think that DCD is under any obligation to work for code that does not comply with the language specification.

[Hackerpilot]

You'll need to fix the CLIENT_SRC and SERVER_SRC declarations in the makefile to get the CI build to pass.

[LaurentTreguier]

The packages correspond to directory names in the source file path.

That was unexpected... DMD stills compiles the code without complaining even if packages and directories don't correspond 😕
But if the specification says so, then so be it... And it makes the organization easier anyway.

You'll need to fix the CLIENT_SRC and SERVER_SRC declarations in the makefile to get the CI build to pass.

Ugh, I forgot about the Makefile and build.bat...

[Hackerpilot]

That was unexpected... DMD stills compiles the code without complaining even if packages and directories don't correspond 😕

This is often the case with DMD.

In case you haven't found it, the relevant part of the spec is under point 2 in https://dlang.org/spec/module.html#module_declaration

[LaurentTreguier]

I didn't look for it, I trusted you on that, you must know the specs a lot better than I do after all the work on DCD