Adding more options for configuring ping passthrough.

[TheMiningTeamYT]

When using Velocity, I have been frustrated by the lack of fine control over ping passthrough, specifically the lack of support for passing through favicons without passing through the whole ping request. I've also seen people on line asking how to pass through favicons, so I decided to add the ability to control which aspects of server list ping requests are passed through from the back end server, and which aspects aren't, through 5 new boolean configuration options in the config file.
Please don't judge my code too harshly, this is my first time writing Java, but it does compile and Checkstyle is okay with it.

[powercasgamer]

This should either respect the original option or handle migration

[TheMiningTeamYT]

Those changes are fine.
And it occurs to me that it probably would have been a good idea to give the commits more descriptive names...
too late now!

[TheMiningTeamYT]

This should either respect the original option or handle migration

It took me months to understand what you were trying to say here; what you wanted me to do, and still longer for me to actually do it. For some reason, I only focused on the minor changes you had requested, and not your actual comment. But today, I sat down and implemented what you actually wanted. My branch now supports falling back to the old ping passthrough system if the new one isn't in use. I've tested the code on my server and the fallback works.
Please consider merging this as soon as possible. I can no longer synchronize my fork due to a minor conflict, and because I have been running a build of this fork since I opened this pull request, this means I can no longer update my personal Minecraft server.