Reimplement click-to-pay links. Add OSX support.

Switch to using Qt's QLocalServer/QLocalSocket to handle bitcoin
payment links (bitcoin:... URIs)

Reason for switch: the boost::interprocess mechanism seemed flaky,
and doesn't mesh as well with "The Qt Way"

qtipcserver.cpp/h is replaced by paymentserver.cpp/h

Click-to-pay now also works on OSX, with a custom Info.plist
that registers Bitcoin-Qt as a handler for bitcoin: URLs and
an event listener on the main QApplication that handles
QFileOpenEvents (Qt translates 'url clicked' AppleEvents into
QFileOpenEvents automagically).

src/qt/bitcoin.cpp

@@ -9,12 +9,13 @@
 #include "guiconstants.h"
 #include "init.h"
 #include "ui_interface.h"
-#include "qtipcserver.h"
+#include "paymentserver.h"
 
 #include <QApplication>
 #include <QMessageBox>
 #include <QTextCodec>
 #include <QLocale>
+#include <QTimer>
 #include <QTranslator>
 #include <QSplashScreen>
 #include <QLibraryInfo>
@@ -70,15 +71,6 @@ static bool ThreadSafeAskFee(int64 nFeeRequired)
     return payFee;
 }
 
-static void ThreadSafeHandleURI(const std::string& strURI)
-{
-    if(!guiref)
-        return;
-
-    QMetaObject::invokeMethod(guiref, "handleURI", GUIUtil::blockingGUIThreadConnection(),
-                               Q_ARG(QString, QString::fromStdString(strURI)));
-}
-
 static void InitMessage(const std::string &message)
 {
     if(splashref)
@@ -117,14 +109,6 @@ int main(int argc, char *argv[])
     // Command-line options take precedence:
     ParseParameters(argc, argv);
 
-    if(GetBoolArg("-testnet")) // Separate message queue name for testnet
-        strBitcoinURIQueueName = BITCOINURI_QUEUE_NAME_TESTNET;
-    else
-        strBitcoinURIQueueName = BITCOINURI_QUEUE_NAME_MAINNET;
-
-    // Do this early as we don't want to bother initializing if we are just calling IPC
-    ipcScanRelay(argc, argv);
-
     // Internal string conversion is all UTF-8
     QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
     QTextCodec::setCodecForCStrings(QTextCodec::codecForTr());
@@ -132,6 +116,12 @@ int main(int argc, char *argv[])
     Q_INIT_RESOURCE(bitcoin);
     QApplication app(argc, argv);
 
+    // Do this early as we don't want to bother initializing if we are just calling IPC
+    // ... but do it after creating app, so QCoreApplication::arguments is initialized:
+    if (PaymentServer::ipcSendCommandLine())
+        exit(0);
+    PaymentServer* paymentServer = new PaymentServer(&app);
+
     // Install global event filter that makes sure that long tooltips can be word-wrapped
     app.installEventFilter(new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));
 
@@ -188,7 +178,6 @@ int main(int argc, char *argv[])
     // Subscribe to global signals from core
     uiInterface.ThreadSafeMessageBox.connect(ThreadSafeMessageBox);
     uiInterface.ThreadSafeAskFee.connect(ThreadSafeAskFee);
-    uiInterface.ThreadSafeHandleURI.connect(ThreadSafeHandleURI);
     uiInterface.InitMessage.connect(InitMessage);
     uiInterface.QueueShutdown.connect(QueueShutdown);
     uiInterface.Translate.connect(Translate);
@@ -249,8 +238,10 @@ int main(int argc, char *argv[])
                     window.show();
                 }
 
-                // Place this here as guiref has to be defined if we don't want to lose URIs
-                ipcInit(argc, argv);
+                // Now that initialization/startup is done, process any command-line
+                // bitcoin: URIs
+                QObject::connect(paymentServer, SIGNAL(receivedURI(QString)), &window, SLOT(handleURI(QString)));
+                QTimer::singleShot(100, paymentServer, SLOT(uiReady()));
 
                 app.exec();