Changes

Review query builder structs (#1716) @danielcweber
Various factorizations and updates (#1715) @danielcweber
Recognize infix expression (#1714) @danielcweber
Review string comparisons in expression parsing (#1713) @danielcweber
Add AndStep/OrStep constructor, deprecate the existing. (#1712) @danielcweber
Call logical step flattening outside of And/OrSteps. (#1711) @danielcweber
Remove ReleaseOnlyFact and configure NullGuard properly (#1708) @danielcweber
Avoid and-operator if its sub-traversals are filters. (#1707) @danielcweber
Fix Gremlin generation for (x.VertexProperty.Id op arg) expressions (#1706) @danielcweber

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