update CClientUIInterface and remove orphan Wx stuff

- fix ThreadSafeMessageBox always displays error icon
- allow to specify MSG_ERROR / MSG_WARNING or MSG_INFORMATION without a
  custom caption / title
- allow to specify CClientUIInterface::ICON_ERROR / ICON_WARNING and
  ICON_INFORMATION (which is default) as message box icon
- remove CClientUIInterface::OK from ThreadSafeMessageBox-calls, as
  the OK button will be set as default, if none is specified
- prepend "Bitcoin - " to used captions
- rename BitcoinGUI::error() -> BitcoinGUI::message() and add function
  documentation
- change all style parameters and enum flags to unsigned
- update code to use that new API

- update Client- and WalletModel to use new BitcoinGUI::message() and
  rename the classes error() method into message()
- include the possibility to supply the wanted icon for messages from
  Client- and WalletModel via "style" parameter

1 files changed, 2 insertions, 2 deletions

diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index 62558a49df..3c8d5903b0 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -147,8 +147,8 @@ signals:
     // this means that the unlocking failed or was cancelled.
     void requireUnlock();
 
-    // Asynchronous error notification
-    void error(const QString &title, const QString &message, bool modal);
+    // Asynchronous message notification
+    void message(const QString &title, const QString &message, bool modal, unsigned int style);
 
 public slots:
     /* Wallet status might have changed */