Merge #7787: [Moveonly] Create ui_interface.cpp

fa10ce6 Move ui_interface.cpp to libbitcoin_server_a_SOURCES (MarcoFalke)
fabbf80 [ui] Move InitError, InitWarning, AmountErrMsg (MarcoFalke)

src/test/test_bitcoin.cpp

@@ -26,8 +26,6 @@
 #include <boost/test/unit_test.hpp>
 #include <boost/thread.hpp>
 
-CClientUIInterface uiInterface; // Declared but not defined in ui_interface.h
-
 extern bool fPrintToConsole;
 extern void noui_connect();