Project Settings - allow config level values for spec generation settings

[Brocco]

In angular-cli.json under defaults add:

"spec": {
  "class": [true/false],
  "component": [true/false],
  "directive": [true/false],
  "module": [true/false],
  "pipe": [true/false],
  "service": [true/false]}

When generating blueprints the precedence will be:

• command-line option value if specified
• value in configuration file
• current default value for each blueprint specified to maintain current functionality

[Brocco]

Awaiting Issue #2447 (via PR #2457) as changes to configuration will be needed to make this similar change.

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