Improved Logitech c270 webcam mount + Snapmaker 2.0 base options

These remixes are based on these three things:

[Logitech C270 tripod, by luc_e, December 27, 2015](https://www.thingiverse.com/thing:398515)

[C270 Focus Ring - OpenSCAD included, by biomushroom, August 24, 2016](https://www.thingiverse.com/thing:1734837)

[snapmaker base plate, by Okatake, February 12, 2018](https://www.thingiverse.com/thing:2790939)

(Note: I tried to officially link more than one source item, but the thingiverse.com search tool kept saying "0 results.")

***Kudos to luc_e, biomushroom, and Okatake for the things.***

Parts list & hardware:

Here's what is included and the minimal hardware that's needed:

- BASE option A — M3x16 screws x 2 (This can be attached to Snapmaker 2.0 enclosure vertical beam near touchscreen.) Then to attach the next flex arm segment (below), M3x20 screw and matching nut.

- BASE option B — M4x16 screws x 4 (This can be attached on the end of a Snapmaker 2.0 linear module.)

- c270_cam1_REMIX — no additional hardware