RFR: 7167: Agent Plugin

[Marcus Hirt]

On Wed, 10 Mar 2021 22:58:07 GMT, Joshua Matsuoka <jmatsuoka at openjdk.org> wrote:

> This PR adds the Agent Plugin to JMC. This is a plugin for controlling the jmc agent and provides a way to attach it and add probes to any JVMs in the JVM browser, as well as providing a preset manager for creating/modifying probe presets.
> 
> There is still a small amount of cleanup to be done so I'll mark it as a draft for now but it would be great to get a review :)

New plug-ins must have both 16x16 and 32x32 pixel versions of icons, and preferably also either a vector version, or a higher resolution variant checked into jmc-graphics. Let me know if you need help inventing something. :)

application/org.openjdk.jmc.console.ext.agent/plugin.xml line 3:

> 1: <?xml version="1.0" encoding="UTF-8"?>
> 2: <!--   
> 3:    Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.

2021 now.

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PR: https://git.openjdk.java.net/jmc/pull/226