Add courtyards around 0.1" PTH header footprints

[sfe-SparkFro]

First off, all footprints should really have a courtyard to ensure DRC catches any accidentally overlapping parts.

Second, if a user wants to solder headers onto a board, there needs to be clearance for the headers, which are 0.1" wide. It's easy to forget this when designing a tight layout, such as the instance below (the outer 2x 0402 footprints would interfere with a header)

Just need to add courtyard rectangles 0.1" wide like so:

[nseidle]

How about a much closer courtyard that would avoid collision with the standoff but still prevent components?

Also, I've added screws and nuts for 4-40 and M3.

[SFE-Brudnerd]

My only argument against a tighter courtyard like what Nate suggests is if a user desires to populate with 0.1" headers then the black plastic could interfere.

[nseidle]

Good point. We could add the outline to layer User1:

It will pass collision errors but make the designer aware of the possible issue.

Good enough?

[SFE-Brudnerd]

WFM!

[PaulZC]

My vote would be F.Fab. I've been using User.1 for milling. I submitted a PR recently to move all User1 text to F.Fab. I'd prefer not to start using it again for things like this...

[PaulZC]

https://github.com/sparkfun/SparkFun-KiCad-Libraries/pull/106#issuecomment-2254102679

[nseidle]

Talking this over with @sfe-SparkFro, we elected to keep the rectangular courtyard so that it does throw an error, and then the designer can exclude the error if they're ok with the collision.

Rectangular courtyards will land in a minute on main.