Left hand justification

Set to false by default, let me know if you think it should be true.

As all cards are played to the left of the screen this feels more
comfortable to use as you dont need to keep looking at different areas
of the screen.

Will auto rearrange when changed during game-play.

cockatrice/src/settingscache.cpp

@@ -77,6 +77,14 @@ SettingsCache::SettingsCache()
     scaleCards = settings->value("cards/scaleCards", true).toBool();
     showMessagePopups = settings->value("chat/showmessagepopups", true).toBool();
     showMentionPopups = settings->value("chat/showmentionpopups", true).toBool();
+
+    leftJustified = settings->value("interface/leftjustified", false).toBool();
+}
+
+void SettingsCache::setLeftJustified(const int _leftJustified) {
+    leftJustified = _leftJustified;
+    settings->setValue("interface/leftjustified", leftJustified);
+    emit handJustificationChanged();
 }
 
 void SettingsCache::setCardScaling(const int _scaleCards) {