request: look at the new xfce4-memgraph-plugin

Hi!

This is for the maintainers. I've been working on a new xfce4-memgraph-plugin.

I know there already was Cationiz3r's memgraph plugin but I've been having difficulties getting that to work, it's based on an old version of the xfce4-cpugraph-plugin.

So I rolled my own fork of the current xfce4-cpugraph-plugin.

Please have a look, try it and let me know what you think! I've added some modes that aren't in either, Continuous is the best I could come up with, it shows memory usage as graph + 2 color gradients to let you discern memory usage at a glance.

Eventually the goal is to relinquish ownership of the fork to the xfce team, and since it's based on the modern cpugraph plugin, maintaining it should, in theory, be somewhat easier.

But it may not be good enough to do that just yet.