[Issue 19472] Allow transitive module attributes (UDAs)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19472

--- Comment #3 from Radu Racariu <radu.racariu at gmail.com> ---
This https://atilanevesoncode.wordpress.com/2018/12/11/what-d-got-wrong/ points
out the "attribute soup" issue, which could be ameliorated by this feature
request. One can simply group similar concerning code with certain attributes
in modules and thus greatly reduce the number of attribute declarations inside
modules and module members.

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