RFR: 8218685: jlink --list-plugins needs to be readable and tidy

[Alan Bateman]

On Wed, 23 Sep 2020 17:41:49 GMT, Ian Graves <igraves at openjdk.org> wrote:

>> I'll shrink narrow those descriptions down to 80 characters.
>> 
>> As to the abstract class, I think it'd make sense to have that implement getUsage, getName, and getDescription --
>> essentially combine all of those very similar things in the same place.
>
> Updated to consolidate documentation/resource-related methods into an abstract base class and shortened the mentioned
> usage bodies to 80 chars or less.

AbstractPlugin might be a better name for the abstract class as it will likely define methods beyond access to name,
description and usage. It also needs a copyright header. StripNativeDebugSymbolsPlugin may have been missed in the
update, it can extend the abstract class too. AddResourcePlugin: the name field can be removed, also should be good to
rename "n" to "name" so it's a bit clearer. TaskHelper - the IDE may have messed up the imports when it was edited.

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PR: https://git.openjdk.java.net/jdk/pull/305