ui fix for thumbnails plugin
first work on skype plugin

began integrating code for skype plugin from nicodemo's work. Done the
first tab (contacts list)
check for already open plugins

when the user asks to run a plugin, ipba2 checks whether there is an
instance already open and in that case brings it in foreground instead
of creating a new one.
sms plugin: indication of chat type and search
skype plugin: calls list tab
ability to toggle right sidebar visibility
View menu and shortcuts to move between windows
more file info on right sidebar

Added: domain, subdomain, full file path
skype plugin chat messages tab
skype plugin file transfers tab
skype plugin group chats tab
skype plugin voicemails tab
birthdate conversion in address book plugin
address book plugin: search by phone or email
skype plugin accounts tab