AM8 (Anet A8) Bowden X carriage stock hotend 3dtouch/bltouch

AM8 (Anet A8) X carriage for bowden upgrade
Support for 2 models of 3d touch sensors : black one and transparent one (see pictures 2 and 3)
Largely inspired from 3displacement project, many thanks to him : https://www.thingiverse.com/thing:3088060

I took his project as a reference point, and tweak it :
* metallic tube support
* add 3dtouch mount
* l level up 25 mm the hotend fixation to get it more stronger and nearest to the guides
* comestic changes here and there

Tested on a AM