Query builder (2 of 3): Refactor filters

[jrhoads]

Purpose

Make filters a bit more consistent. Consistently use the terms filter instead of term. Adjust parameters to pass in an array with a single element if it had previously been a term filter.

Open Questions and Pre-Merge TODOs

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

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• Consider using positive language as opposed to neutral when offering feedback. This is to avoid the negative bias that can occur with neutral language appearing negative.
• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
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