Bug 16989 – Ensure that every Phobos function has Returns/Params

From https://wiki.dlang.org/Vision/2016H2: > Make sure every function in Phobos has Params: and Returns: sections http://www.digitalmars.com/d/archives/digitalmars/D/Phobos_Documentation_-_call_to_action_258777.html I started to hack together a Dscanner plugin that yields a list of undocumented functions: https://github.com/Hackerpilot/Dscanner/pull/390 It's about 1K and we should think how we can crowd-source this. Maybe adding a blacklist and then gradually removing modules from this blacklist? Unfortunately Dscanner doesn't support partial blacklisting for checks, so we could either 1) implement partial blacklisting for checks in Dscanner 2) add a workaround like running dscaner in the `style` target in the `posix.mak` at Phobos again with the blacklist and: echo 'properly_documented_public_functions = "enabled"' > .dscanner.ini

DScanner now supports partial blacklisting and `properly_documented_public_functions` can be fixed modulewise.

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