[INTERNAL] Removes SarosMainPanelView from intellij.Saros

Change-Id: I1528d9000b9db9ac200c71c7f5b4dfe83ec065a7
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1998
Tested-by: Jenkins CI
Reviewed-by: Christian Cikryt <c.cikryt@googlemail.com>
Reviewed-by: Arndt Lasarzik <alasarzik@gmail.com>
Reviewed-by: Holger Schmeisky <google@schmeisky.com>
[Internal] extracted two account handling methods from ConnectServerAction and made them publicly accessible
Merge remote-tracking branch 'origin/master'