Allow FormatterOptions to be altered by hooks

[greg-1-anderson]

Goal

Dynamically alter the way output is formatted in a post-process hook, e.g. to dynamically select the default fields based on the command output.

Expected behavior

The FormatterOptions should be available via a method of CommandData.

Actual behavior

FormatterOptions is created in a protected method CommandProcessor::writeUsingFormatter() immediately before it is used.