Revise image build naming convention

[rs232]

As discussed here:

https://www.linksysinfo.org/index.php?threads/official-freshtomato-org-internet-site.75333/post-324997

It would be a good timing to define a structural naming convention.

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An interesting link where to start from if the old Shibby naming convention:

https://tomato.groov.pl/?page_id=66

[Hogwild]

I’ve put some of this for ARM architecture in FAQ section of the wiki. I have no info. at all for the MIPS architecture, so can’t help until someone gives me details.

[pedro]

What could be done has already been done. Nothing more can be thought of here due to the complexity (especially for the MIPS branch) of image names and the router models that match them.