Scripted fields in Visualize

[w33ble]

Add scripted fields to the agg builder. Also handles situations where scripted fields are renamed or removed, via redirectWhenMissing

• Fields can now be indexed fields or scripted fields
• Indexed fields are set as params.field as normal, scripted fields are appended as params.script
• Added matchAny filter, which takes an array of criteria, any of which can match (uses _.some)
  • Used to select indexed or scripted fields

[rashidkpc]

Currently this lets the user set the type to a variety of number formats. We don't actually use those in the app, rather just normalizing to "number" which should be sufficient. By this, I mean the script editor :-)

[rashidkpc]

I filed a couple new tickets on the field editor that @lukasolson is checking out. This, however, looks good.