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/bitcoinaddressvalidator.h

@@ -1,7 +1,7 @@
 #ifndef BITCOINADDRESSVALIDATOR_H
 #define BITCOINADDRESSVALIDATOR_H
 
-#include <QRegExpValidator>
+#include <QValidator>
 
 /** Base48 entry widget validator.
    Corrects near-miss characters and refuses characters that are no part of base48.
@@ -9,16 +9,13 @@
 class BitcoinAddressValidator : public QValidator
 {
     Q_OBJECT
+
 public:
     explicit BitcoinAddressValidator(QObject *parent = 0);
 
     State validate(QString &input, int &pos) const;
 
     static const int MaxAddressLength = 35;
-signals:
-
-public slots:
-
 };
 
 #endif // BITCOINADDRESSVALIDATOR_H