StringUtils.fillIn vs PatternStringProperty

[samreid]

During code review #103 we saw that FieldMeterNode.ts, ACNumberControl and PercentControl are using StringUtils.fillIn whereas PatternStringProperty is used in PercentControl and DCPowerSupplyNode. Would it be better to use PatternStringProperty everywhere?

[pixelzoom]

PatternStringProperty requires a TReadOnlyProperty<string> as its first argument.

FieldMeterNode: The pattern is not a Property, and I did not want to artificially create one for a static string. 9 PatternStringProperty instances per FieldMeter x 5 screens = 45 unnecessary PatternStringProperty instances. DerivedStringProperty is the better choices here.

ACNumberControl: PatternStringProperty is irrelevant here. The use of StringUtils.fillIn is in the numberFormatter option to a NumberDisplay.

PercentControl: PatternStringProperty is used were appropriate. The 1 use of StringUtils.fillIn is in the numberFormatter option to a NumberDisplay.

Reopen if I missed anything.