Simpler bindings / Declare process | Part 1

[h44z]

Split #80 into two parts. This part contains:

• queue, exchange and binding declaration is now simplified and much clearer to use
• updated examples

[wagslane]

To make sure I understand - This primarily accomplishes 2 things:

1. You can opt to not declare exchanges and queues
2. It changes the shape of the options structs

Is that accurate?

If so, I'm cool with the "opt out" of exchange declare, but I don't love changing the shape of the options struct for little benefit

[h44z]

1. Yes, if you do not need to declare queues (as they might already exist for example)
2. Yes, but as the structs are only used inside the API implementation, this should not be a big deal.

[wagslane]

Thanks @h44z !