[yocto] naming .bb files

[Barros Pena, Belen]

Bug 4193 will allow Hob users to save their customised images into a .bb
file. As part of the saving flow, users will need to give their .bb file a
name, and we need to ensure such names are valid.

There seem to be certain rules regarding .bb files naming, but apparently
those are not written anywhere. Some of those rules seem to be:

* No spaces
* Underscores can only by used to separate name and version
* No ASCII special characters
* No non-ASCII characters
* No uppercase letters

Does anybody know of any others we should be aware of?

Thanks!

Belén

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