public abstract class FacesConfigurationMerger
SPI that uses the FacesConfigurationProvider-SPI to get all FacesConfig data
and then it combines it into one FacesConfigData instance. For this merging
process the ordering and sorting rules of the JSF spec must be applied.
With this SPI it is possible to store the result of the complex ordering and
sorting algorithm in order to skip it if no configuration changes are applied
Implementations of this SPI can take advantage of the decorator pattern in
order to use the default SPI-impl.