Cleanup trailing whitespace
Auto indent (vim). It was a mix of space and tab indents... now all spaces.
Further cleanup and alignment for readability

Aligned some parts of the code for better readability.
Folded some things into next line to align for better readability.
Also @helmo had missed some tabs, converted them to spaces too.
Fixed script description
Enough fumbling, let's call this 0.2
More clear wording
Set version number to 0.2
Ported privmsg privacy option from growl-net

If xmpp_reveal_privmsg is set to OFF, then the notification
will only state the nick name and not the content of the message.

Ported from https://github.com/kfdm/irssi-growl
Ported topic notifications from growl-net

If xmpp_show_topic is set to ON, then notifications
for topic changes will be sent.

Ported from https://github.com/kfdm/irssi-growl