[Engine-XMPP] added /contact command

add a new contact (contact will receive a subscription request)
/contact add jid
allow a contact's subscription request
/contact allow jid
deny or revoke a contact's subscription request
/contact deny jid
remove a contact from the roster
/contact remove jid
rename a contact
/contact rename jid newnick
[Frontend-GNOME] Ctrl-C copies message area selection if entry has no selection
Merge pull request #4 from oli-obk/feature/ctrl-c_copy_logic

[Frontend-GNOME] Ctrl-C copies message area selection if entry has no selection
[Frontend-GNOME] Renamed Quick Connect to Connect in menu
[Frontend-GNOME] Mac OS X love

This OS X love patch brings:
- Global Menu
- IRC URL handler
- Quit application handler
- Reopen main window handler
- Command key keyboard short cuts instead of alt key
- Command + Up / Down / { / } to switch chat windows
- Command + H short cut to minimize the main window
- Command + W on last chat window will minimize the main window
- File menu renamed to Smuxi

Inspired by changes described here:
https://live.gnome.org/Smuxi/Porting/Mac

Kudos to Jonathan Pryor and Michael Lutonsky for OS X guidance and testing
[Frontend-GNOME] Workaround GTK+ accelerator key issue on Mac OS X which uses W without modifier for the stock close menu item
[Frontend-GNOME] Show command key as accelerator for close menu item on Mac OS X
[Build] Added #smuxi channel stat bot
[lib/SmartIrc4net] Updated to fix auto reconnect regression
[Frontend-GNOME] Implemented new menu interface

- Implemented new menu interface as designed by Georgi Karavasilev (me4oslav)
- Refactored menu code from MainWindow to MenuWidget
[Frontend-GNOME] Removed extra spacing from menu
[Frontend-GNOME] Replaced <Primary> with <Control> for Gtk.Action accelerators as older GTK+ versions don't support it
[Frontend-GNOME] Added dllmaps for OS X to smuxi-frontend-gnome.exe.config
[Debian] Exclude OS X specific libraries from dh_clideps, hopefully fixes the Debian auto builder
[Engine] ProtocolManager.ToString() is too verbose (and expensive) to be used for parameter tracing
[Build] Use dmcs for OS X builds
[Frontend-GNOME] Hide Smuxi menu and fixed quit and close shortcuts on OS X
[Frontend-GNOME] Center dialogs on OS X
[Frontend-GNOME] Use Menlo and fallback to Monaco font on OS X by default
[Frontend-GNOME] Added GeekShed favicon support