Use 2512 SMD resistors in place of strain gauges (#104)

As suggested in #24 (comment) and inspired by https://github.com/IvDm/Z-probe-on-smd-resistors-2512, this adds 4x 330 ohm 2512 SMD resistors to the back to act as strain gauges, rather than requiring discrete strain gauges to be glued and wired up.

Also applies a few changes I accidentally had pending locally:
- Custom footprints for the 2 3.3v LDO options to clarify the pinout options
![image](https://user-images.githubusercontent.com/414890/204078474-8327e8ed-78b5-4fe3-a91d-9c20fe54fcbc.png)
- some BOM note updates

Fixes #24
Closes #33

Move C10 slightly so that paste/stencil matches v0.2

Extract release version number from tag, if applicable

Extract release version number from tag, if applicable

Extract release version number from tag, if applicable

Change View Base to v0.2

Clean up schematic

Clean up schematic