Add missing foundation colours and deprecate duplicate colour variable #3071
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Fixes #3031
Adds missing status colours to the foundations documentation. In the process realised that
$cads-language__warning-colour
is a duplicate of$cads-language__error-colour
. I've removed internal references to the duplicate variable and document it as deprecated.We could simply remove the variable and require applications to replace the reference or leave it for a little while and replace it more gradually. There's no way to add a deprecation warning to a plain variable.