[SlimDevices: Beta] --plugins

[Kim B. Heino]

Hello,

It would be very useful if slimserver.pl would support "--plugins dir" 
command line option for specifying extra root directory for plugins. 
That dir should be scanned in addition to normal Plugins/ -directory.

Currently I have to have write access to slimserver/Plugins/ -directory 
to install 3rd party plugins. It would also make things more clear: 
which files are from SD and which are 3rd party.

By looking at PluginManager.pm this should be quite easy thing to add.