Bitcoin-Qt: massive header and cpp cleanup

- try to enforce the same style to all Qt related files
- remove unneeded includes from the files
- add missing Q_OBJECT, QT_BEGIN_NAMESPACE / QT_END_NAMESPACE
- prepares for a pull-req to include Qt5 compatibility

src/qt/test/uritests.cpp

@@ -4,15 +4,6 @@
 
 #include <QUrl>
 
-/*
-struct SendCoinsRecipient
-{
-    QString address;
-    QString label;
-    qint64 amount;
-};
-*/
-
 void URITests::uriTests()
 {
     SendCoinsRecipient rv;