Remove ability to unpack .dna.json

[willemolding]

PR summary

Closes #1859

This has been causing some issues lately (#1846 and #1824) and not getting much use as a feature. This PR removes the meta data from the .dna.json as well as preventing it from slurping up all the random files you forget to add the the .hcignore. Now it will only slurp up WASM that is in a directory with a .hcbuild. This should prevent a lot of issues people are having with large bundles among other things.

It also removes the hc unpackage option from the CLI

changelog

• if this is a code change that effects some consumer (e.g. zome developers) of holochain core, then it has been added to our between-release changelog with the format

- summary of change [PR#1234](https://github.com/holochain/holochain-rust/pull/1234)

documentation

• this code has been documented according to our docs checklist

[thedavidmeister]

also note that holonix is in an unreleasable state with develop failing builds on all platforms due to the scaffolding repos generating zomes that show errors

e.g. https://circleci.com/gh/holochain/holonix/1279

[zippy]

Hey there. Looks like you got some cruft around trycp in this branch by accident. I'm guessing you did work on this between when two portions of trycp were added in, and so this PR is deleting a bunch of important stuff that got merged into develop later.

[zippy]

Ok. I guess maybe it was a case of YAGNI when we originally implemented it. The real use-case was packaging for use by the conductor, not for use by other coders. And given the problems it's cause I'm ok removing it now.

However, please fix the merge issue that's deleting trycp code!

[willemolding]

Hey there. Looks like you got some cruft around trycp in this branch by accident. I'm guessing you did work on this between when two portions of trycp were added in, and so this PR is deleting a bunch of important stuff that got merged into develop later.

Ah yep good catch. Fixed