Change the multipart lib to improve performances

[ClemPi]

Related to #2355 I reworked the Multipart handling and used https://github.com/Vodurden/Http-Multipart-Data-Parser to do so.

Here are some performances test I made:

	before	after
2GB	55s	33s
4GB	120s	75s
8GB	314s	285s

Please let me know if this look OK for you before I start working on the tests. I included all the lib, maybe we want to only pick relevant classes.

Regards

[thecodejunkie]

Hi,

Nice! This is one of those things that you just don't pull in without giving it a proper code review and step the code a bit. Even then it's a nightmare to dare to pull the merge button because of the uncertainty of that scenarios that might be broken :D

So before we start reviewing that, there are some pretty big code style violations that would need to be fixed. I would prefer if they were addressed before we even started looking at the actual implementation logic. You can find the style guides here (they were also linked during the pull-request process)

Thanks

[ClemPi]

I'm aware that the code added in HttpMultipart directory is not coding style compliant.
As I said the code is coming from a lib, and I think it will be easier to maintain this kind of "external" dependency if we don't change the code too much. Looks like it's already the case for TinyIOC.

Regards

[aidapsibr]

Rather than directly pull in the codebase, can we learn from it and apply changes to the existing handling?