[RFC]: Replace Controllers with Handlers

[arhimede]

RFC

Q	A
Proposed Version(s)	1.2.0
BC Break?	Yes

Goal

proof of concept
use Handlers instead of Controllers
to use better the middleware pipes
See this comment of @Xerkus dotkernel/api#313 (comment)

[arhimede]

Which is the best approache ?

A. method in filename:
Page/Handler/GetAboutUsHandler.php
Page/Handler/PostAboutUsHandler.php

B. all methods in one handler in filename:
Page/Handler/AboutUsHandler.php

[arhimede]

@MarioRadu
Keep the PAGE module then
without switch

[alexmerlin]

Implemented in #33