Made pipelines more flexible.

[Kemsekov]

I lacked a lot of features so I added them.

I lacked the ability to customize the work of each middleware, so I added this by creating custom ovverides for Add and Chain functions. But because of this feature a whole pipeline workflow had to be re-implemented. I am not sure if I am have an authority to ask merge with such big changes, but whenever I need to use pipelines in c# I use my own implementation, so maybe I can merge to you. ~_~