dive edit gets contextual actions

Option to switch between view and edit and to save the changes are now
in the context drawer. Let's see how this works out.

If it turns out to be badly discoverable (which is what I'm worried
about), this needs to be fixed at component level.

qt-mobile/qml/DiveDetails.qml

@@ -1,5 +1,5 @@
 import QtQuick 2.3
-import QtQuick.Controls 1.2
+import QtQuick.Controls 1.4
 import QtQuick.Controls.Styles 1.2
 import QtQuick.Dialogs 1.2
 import QtQuick.Layouts 1.1
@@ -75,20 +75,6 @@ MobileComponents.Page {
 				width: flick.width
 				height: childrenRect.height + MobileComponents.Units.smallSpacing * 2
 
-				Button {
-					checkable: true
-					text: "Edit"
-					z: 999
-					anchors {
-						top: parent.top
-						right: parent.right
-						margins: MobileComponents.Units.gridUnit / 2
-					}
-					onCheckedChanged: {
-						diveDetailsWindow.state = checked ? "edit" : "view"
-					}
-				}
-
 				DiveDetailsEdit {
 					id: detailsEdit
 					anchors {