Consider upgrading to cactoos 0.45+ with new iterable API

[victornoel]

Since the version currently used of cactoos (0.43), cactoos changed its API by:

• removing all the decorators for the concrete collections
• focusing the decorators around Iterable and Iterator
• introducing some classes such as SetOf, ListOf, etc for transforming an Iterable into a concrete collection

This is meant to simplify cactoos code and force users of the library to use more OO code relying on Iterable as the basic element of composition.

Jpeek should upgrade to this latest version, it would simplify its code and allow us to use the latest features that could be needed (that's why I created this issue initially, I wanted to use a feature from latest cactoos but can't because the upgrade takes time).

Since this is going to have to be done in one chunk, I would recommend boosting this job and give it to someone who have an idea of what's to be done clearly (I can do it ;)

[victornoel]

@paulodamaso 0crat seemed to have missed this and didn't notify you, WDYT?

[paulodamaso]

@victornoel Yeah, let's do it

[paulodamaso]

@0crat in

[0crat]

The job #474 assigned to @dfrau32/z, here is why; the budget is 30 minutes, see §4; please, read §8 and §9; if the task is not clear, read this and this; there will be a monetary reward for this job

[0crat]

@dfrau32/z this job was assigned to you 5days ago. It will be taken away from you soon, unless you close it, see §8. Read this and this, please.

[0crat]

The user @dfrau32/z resigned from #474, please stop working. Reason for job resignation: It is older than 10 days, see §8

[0crat]

The job #474 assigned to @dgarus/z, here is why; the budget is 30 minutes, see §4; please, read §8 and §9; if the task is not clear, read this and this; there will be a monetary reward for this job

[0crat]

The user @dgarus/z resigned from #474, please stop working. Reason for job resignation: It is older than 10 days, see §8