Update tracker URL.

Use central tracker from distributable PyInstaller-generated executable, use customizable tracker from regular Python code for development.
Include ScriptVox script in the final executable bundle.
Automatic setup and launch of DOSVOX parts.

This commit adds functionality to let XMPPVOX automatically install itself within an existing DOSVOX installation. It will also automatically launch the utility script to collect JID and password and run Papovox.

No more complicated installation steps :D