Subpart texture file path

[Travis Cobbs]

Revision done. Proposed changes in red.
https://www.ldraw.org/draft-texmap.html

I find the wording of the FALLBACK update to be confusing. Specifically, "... required if ... not used". In my opinion, the following wording conveys the same meaning in a less confusing manner:

The FALLBACK section is required unless the NEXT command is used or the geomtery2 section is missing.

However, the above actually changes the requirements of the spec, which I don't feel is warranted here. Simply put, the FALLBACK section is never required based on the original spec, and I don't feel we should be changing that. However, I can definitely see how it should be required in official parts if there is no geometry2 section.

So, my suggestion for the TEXMAP spec would be something more like this:

Note: the FALLBACK section is always optional, although it is highly recommended any time there is no geometry2 section.

Then, in the Official parts document, we can add a restriction that upgrades that "highly recommended" to "required".

Note that this means that NEXT can then only be used in official parts if the next line is a type 1 line and not a 0 !: line, while your suggested change would allow NEXT to be used in official parts even if that were not the case.