Add SCIFIO options

Creates an `OptionsPlugin` for harvesting SCIFIO-specific information and populating a `SCIFIOConfig` instance, in the spirit of the Bio-Formats importer dialog.

Plugins can now use `SCIFIOConfig` `@Parameter`s, which will be populated using the `OptionsSCIFIO` plugin.

`OptionsSCIFIO` can be extended to add more options, saving them in the `SCIFIOConfig` using the `OptionsSCIFIO#populate` method.