Request: allow multiple instances of the Launcher to run

[Kommunističeskiĭ]

I like to play using multiple accounts simultaneously for various utility purposes on multiplayer servers. I figured out how to launch multiple instances (run technic-launcher.jar directly) but others like me may not have stumbled upon that. Everything works without problems with 4 instances running at once (tested with both Tekkit Classic and Lite), so I don't see why the EXE launcher purposefully cripples this behavior.