Finalize deprecation of old language track file structure

[kytrinyx]

A while back we started moving all of the exercise implementations into a subdirectory called exercises in each of the stand-alone language track repositories.

That is to say that instead of having a mix of bin, docs, and individual exercises,
we can have bin, docs, and exercises in the root of the repository, and all
the exercises collected in a subdirectory.

In other words, instead of this:

x{TRACK_ID}/
├── LICENSE
├── README.md
├── bin
│   └── fetch-configlet
├── bowling
│   ├── bowling_test.ext
│   └── example.ext
├── clock
│   ├── clock_test.ext
│   └── example.ext
├── config.json
└── docs
│   ├── ABOUT.md
│   └── img
... etc

we have something like this:

x{TRACK_ID}/
├── LICENSE
├── README.md
├── bin
│   └── fetch-configlet
├── config.json
├── docs
│   ├── ABOUT.md
│   └── img
├── exercises
│   ├── bowling
│   │   ├── bowling_test.ext
│   │   └── example.ext
│   └── clock
│       ├── clock_test.ext
│       └── example.ext
... etc

The production code handles both variants (and has for a while), but now we're starting to get eager to delete the old code that handles the deprecated version.

There are a few repositories that have not yet moved their exercises, so we'd need to finish doing that first (listed below).

[ajwann]

I can take care of this.

[ajwann]

exercism/cpp#63 is already done
PR to xcoldfusion
PR to xhaxe
PR to xnasm
PR to xtcl
PR to xvbnet

Two projects, xnasm and xtcl don't have any exercises. For those projects I just created the exercises directory and put a note inside referencing this issue and instructing future contributors to put new exercises in the exercises directory.

[kytrinyx]

Thank you so much @definemethod! I'm so excited about all the code we'll get to delete now :-)

[ajwann]

Happy to help!

[stale]

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