begin integration with bitcoin upstream

gui/src/bitcoinaddressvalidator.cpp

@@ -0,0 +1,8 @@
+#include "bitcoinaddressvalidator.h"
+
+const QString BitcoinAddressValidator::valid_chars = "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
+
+BitcoinAddressValidator::BitcoinAddressValidator(QObject *parent) :
+    QRegExpValidator(QRegExp("^["+valid_chars+"]+"), parent)
+{
+}