AMXX.pl: Support AMX Mod X i SourceMod

Hi everyone! A few announcements.

First, I'm proud to announce https://forums.alliedmods.net/member.php?u=7779' target="_blank">Arkshine as the official maintainer for AMX Mod X. As one our earliest community members, Arkshine understands both the project's history and the current landscape of the community. He's been extremely helpful reviewing patches and fixing bugs, and has shown excellent judgment in making sure AMX Mod X remains a high quality tool. Please welcome Arkshine!

Second, we have moved the AMX Mod X source code to GitHub.

A little over 10 years ago, SniperBeamer founded AMX Mod X. Its sister project, AMX Mod, had been abandoned. No one had write access to the source code, and critical pieces were closed-source. SniperBeamer forked it into the most public place possible - at the time, SourceForge - to ensure that it would outlive its maintainers. As the project grew and source control systems improved, SourceForge became a burden, and we moved all hosting to AlliedModders.

10 years later, that landscape has changed again. GitHub is much more accessible than either our tools or other project hosting sites. It has a much simpler workflow and provides both projects and individual contributors with a great deal of public visibility. I'm hoping that this move affords AMX Mod X continued life, and our contributors more ways to interact with the development community at large.

We'll continue to use https://bugs.alliedmods.net/ for bug reporting and release management. For more information on Git and GitHub, see: https://wiki.alliedmods.net/Git_Tutorial