IrTrans installation on Linux: prettier interface

[klues]

With #131 a autostart of irserver was implemented, so irserver is started everytime a irTrans command is sent and there is no connection to irserver.

While on Windows this autostart can be done in background, on Linux unfortunately it is necessary to run irserver with root priviledges and therefore there has to be some kind of password prompt. Currently irserver is started by https://github.com/asterics/AsTeRICS-Ergo/blob/master/custom/bin/ARE/tools/start_irserver.sh skript in a terminal, where the password has to be inserted. This could be prettier solved with e.g. gksudo or kdesudo.
see https://github.com/asterics/P4AllBuildingBlocks/blob/master/CameraInput/XFacetrackerLK/package/linux/postinst.sudo#L66 how this could be solved in a script.

The best thing would be to patch irserver in order to not need admin priviledges - but this is not an easy task: https://github.com/asterics/IRTrans-Server

[klues]

maybe it is not necessary to have several ApplicationLauncher instances for different Linux versions with different terminals (like now) but it is possible to just start bash directly with application launcher like
bash /opt/asterics-ergo/app/start.sh