Hans Larsen 456614828f feat(@angular/cli): allow flags to have deprecation
The feature comes from the "x-deprecated" field in schemas (any schema that is used
to parse arguments), and can be a boolean or a string.

The parser now takes a logger and will warn users when encountering a deprecated
option. These options will also appear in JSON help.
2018-11-14 10:29:07 -08:00
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