BearMera Volcano BLTouch mount

#BearMera BLTouch mount for Volcano Hotend
## Credits
This is a remix of the great work from
* [ChipCE](https://www.thingiverse.com/ChipCE) : [Bearmera Bltouch mount](https://www.thingiverse.com/thing:4820183), which is also a remix of
* [pekcitron](https://www.thingiverse.com/pekcitron) : [Bear Extruder and X axis (BearExxa) 1.0.0 MK2.5S MK3S](https://www.thingiverse.com/thing:4362586), more specifically the BearMera derviate linked there and found on [Github](https://github.com/gregsaun/bear_extruder_and_x_axis/blob/master/optional_parts/bear_hemera/)

## Description
The original design was modified and extended by the bltouch mount, inspired by ChipCE's design. X/Y measurements have been take from him (so offsets are the same) but lowered Z for 8.5 mm towards printing-surface, as this is the difference between original V6 hotend and Volcano.

Any comments are welcome.

### Update 2021-01-10 21:57
I have this part in pre-production for some time now and it works fine. T