Drop bar dropper post remote lever Version 3

This is yet another iteration of a dropper lever for drop handlebars, as the remix links should indicate. I have redesigned it so that it clamps lower on the drops for a better hand position when holding on in the drops.

It still uses the same brake lever bar clamp as the previous design, but now instead of using a single 608 bearing, it uses two 625 bearings with a spacer to separate them and keep the bolt from side loading them too much. If there is too much friction when the lever is bolted to the body, reprint the bearing_spacer with slightly scaled up Z.

There are two kinds of brake lever band clamps
* One with a T-headed bolt that sticks out of the clamp and is bolted on with a recessed nut that's round on the outside. **This is the kind you should use.**
* One that has a threaded part welded to the clamp and uses a regular M6 bolt. **This project is not designed for this style.** It is too big.

Parts needed:
* Dropper post with cable, housing, ferrules, and cable cla