report-fossil: Add --ignored-style option
The current behavior remains the default, is called 'short' and there are two new options.
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'short' prints the counts plus a limited number of shaders and games affected.
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'count' prints the number of shaders only after and only before, sometimes referred to as Gained and Lost.
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'full' prints the count above plus the names of all shaders.
This shouldn't affect the output unless 'count' or 'full' is explicitly selected.