GUI for --disable-wallet compiles and -disablewallet mode

There is not much in the GUI to be done without wallet,
though it's possible to change options, watch the sync process,
and use the debug console.

So embed the debug console in the main window.

src/qt/test/test_main.cpp

@@ -1,5 +1,11 @@
 #include "bitcoin-config.h"
+#if defined(HAVE_CONFIG_H)
+#include "bitcoin-config.h"
+#endif
+
+#ifdef ENABLE_WALLET
 #include "paymentservertests.h"
+#endif
 #include "uritests.h"
 
 #include <QCoreApplication>
@@ -27,10 +33,11 @@ int main(int argc, char *argv[])
     URITests test1;
     if (QTest::qExec(&test1) != 0)
         fInvalid = true;
-
+#ifdef ENABLE_WALLET
     PaymentServerTests test2;
     if (QTest::qExec(&test2) != 0)
         fInvalid = true;
+#endif
 
     return fInvalid;
 }