Remove Core::Context in favor of smarter Core::Request

[xsawyerx]

One thing that bugs me is Core::Context. It is created in the app from the request, contains a reference back to the app, and the app contains a reference to itself. It holds both data and actions, but neither on itself.

Until now I wasn't even sure what the hell it is exactly meant for. Now I understand it better, and it seems like we could actually remove it (and some duplicate code that exists there) in favor of making the Core::Request object more aware of able.

I'd like to get some opinions on this.

[xsawyerx]

@mickeyn and I are hacking on it.

[xsawyerx]

We've done a ton of work on this, available in a branch.

We were basically able to remove from the codebase the biggest part of the Core::Context variable, which is its request attribute. That's the majority of what's used in it. Friday we will continue and try to detach more and more strings.

All tests pass so far.

[mickeyn]

so, https://github.com/PerlDancer/Dancer2/tree/feature/untangle-context is fully functional and context-less.
we need reviewing before merging it, anyone want to assist with that?

[xsawyerx]

I am willing to offer $something in exchange. Just please someone review this. @mickeyn and I will be happy to help lend our explanation and assistance.

I'd prefer not to push it without another person (or more) reviewing this.