Add option to filter invalid items when loading a config

[Nokel81]

• Default is "Throw"
• Could be later extended to return a list of errors along side the
  config

Fixes #499

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[Nokel81]

I signed it

[brendandburns]

Generally looks good, but you need to sign the CLA.

[brendandburns]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, Nokel81

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