qml: Add copy icon

The copy icon will be used to initiate a copy to clipboard
when it is clicked.

Author: johnny9

src/Makefile.qt.include

@@ -337,6 +337,7 @@ QML_RES_ICONS = \
   qml/res/icons/caret-left.png \
   qml/res/icons/caret-right.png \
   qml/res/icons/check.png \
+  qml/res/icons/copy.png \
   qml/res/icons/cross.png \
   qml/res/icons/error.png \
   qml/res/icons/export.png \

src/qml/bitcoin_qml.qrc

@@ -94,6 +94,7 @@
         <file alias="caret-left">res/icons/caret-left.png</file>
         <file alias="caret-right">res/icons/caret-right.png</file>
         <file alias="check">res/icons/check.png</file>
+        <file alias="copy">res/icons/copy.png</file>
         <file alias="cross">res/icons/cross.png</file>
         <file alias="error">res/icons/error.png</file>
         <file alias="export">res/icons/export.png</file>

src/qml/imageprovider.cpp

@@ -77,6 +77,11 @@ QPixmap ImageProvider::requestPixmap(const QString& id, QSize* size, const QSize
         return QIcon(":/icons/check").pixmap(requested_size);
     }
 
+    if (id == "copy") {
+        *size = requested_size;
+        return QIcon(":/icons/copy").pixmap(requested_size);
+    }
+
     if (id == "cross") {
         *size = requested_size;
         return QIcon(":/icons/cross").pixmap(requested_size);