Bidirectional describe() <-> build()

[hueniverse]

Construct a schema using the description format.

Flags:

• default, failover - plain value changed from value to { value }, function changes to direct reference without description.
• allowUnknown -> unknown
• allowOnly -> only

Options:

• Changed options to preferences

Types:

• lazy once flag moved to root
• object shallow flag removed from describe()
• alternatives wraps 'schema' matches item, rename alternatives to matches
• boolean remove true false from default list of truthy/falsy
• change symbol error string format
• object patterns regex value changed to { regex }
• change ref description (remove key, add all other properties when not the default, change ref to type and wrap in { ref } when object key is not ref).
• Move description, label, and unit to flags
• Renamed children to keys
• Change string.regex to string.pattern and change arg to { pattern, options }
• array unique arguments changed to original args
• object instanceof arguments changed to original args

Valids / Invalids:

• nun-null objects changed from value to { value }
• rename valids to allow and invalids to invalid
• only included if different from type default

Tests:

• arg changed to args
• single argument always include argument name

Misc:

• meta -> metas