Include additional VHDL syntax rules - Linting

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Hi,

@Dave: I'm over 40years now, thus my ears are degrading and I need my code to shout to catch my attention ^.^

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I've been doing VHDL design for 20 odd years now and my eyesight isn't getting any better. I think that the easiest style to parse

is well spaced and indented code in lower case with an _odd_ thing in uppercase. I use uppercase for constants but pretty much

everything else is in lower case.

And as 'yer man said it'll make code entry a lot more hassle if keywords etc are in uppercase.

Nial.