Headless mode

Hi there,

A little while back I added a headless mode for remotedroid. It lets you specify the --hidden parameter to hide the application to the systray on load (or run without a GUI at all if it can't create the icon).

Looking at the files changed, the only important ones are RemoteDroidServer.java and AppFrame.java, but it seems my IDE updated some metadata and the like which you can safely ignore if you want.

Not sure if this is something you're interested in, but let me know if you have any issues.

Cheers,
Ash.