Sticker bottoms - Subfile or Primitive

[Max Martin Richter]

A couple of thoughts:
- I think subparts are a better location for these. Yes, I know about the documentation question but nothing is stopping us from have the same proposed naming convention.
- Regardless of the above, formed backs should always be subparts. The primitive folder should be kept as clean a possible and I don't want a bunch of obsolete prims because the part number changed.
- IRL all stickers have rounded corner but corners should only be modeled rounded if the rounding is more that the default.

At least the last point is not correct.
Until the late 90s almost all stickers had sharp corners. Nowadays they are rounded.