Add OptionsSCIFIO class

This class can be used to populate SCIFIOConfig instances via the
SciJava plugin framework.
Create ConfigPreprocessor

This preprocessor will allow the use of SCIFIOConfig @Parameters. Uses
the OptionsSCIFIO plugin to generate a SCIFIOConfig.
Add io.scif.options package-info.java

Adds javadoc for the new io.scif.options package.