Added some basic IPC functionality using wxServer, wxClient and wxConnection.

Added the -blockamount command line option for an example of usage.

ipc.cpp

@@ -0,0 +1,33 @@
+/*
+ * Inter-process calling functionality
+ */
+
+#include "headers.h"
+
+wxConnectionBase * CServer::OnAcceptConnection (const wxString &topic) {
+    return new CServerConnection;
+}
+
+wxConnectionBase * CClient::OnMakeConnection () {
+    return new CClientConnection;
+}
+
+// For request based handling
+const void * CServerConnection::OnRequest (const wxString &topic, const wxString &item, size_t *size, wxIPCFormat format) {
+    const char * output;
+
+    if (item == "blockamount") {
+        stringstream stream;
+        stream << nBestHeight + 1;
+        output = stream.str().c_str();
+    }
+    else
+        output = "Unknown identifier";
+    
+    return output;
+}
+
+// For event based handling
+bool CClientConnection::OnAdvise (const wxString &topic, const wxString &item, const void *data, size_t size, wxIPCFormat format) {
+    return false;
+}