Support sending multiple commands to a running instance

[selvanair]

Make it possible to use --command action arg multiple times. See Trac #498 Summary of commits: (i) Usages like --command connect vpn1 --command connect vpn2 --command disconnect vpn3 when the GUI is already running is now supported. (ii) When sending multiple commands to a running instance of the GUI, simplify usage of the form openvpn-gui.exe --command connect vpn1 --command connect vpn2 --command disconnect vpn3 by omitting command so that one could also write openvpn-gui.exe --connect vpn1 --connect vpn2 --disconnect vpn3 For connect this already worked, but do so for other commands too. (iii) copy resource file changes to all langauge files