Move subsurface-core to core and qt-mobile to mobile-widgets

Having subsurface-core as a directory name really messes with
autocomplete and is obviously redundant. Simmilarly, qt-mobile caused an
autocomplete conflict and also was inconsistent with the desktop-widget
name for the directory containing the "other" UI.

And while cleaning up the resulting change in the path name for include
files, I decided to clean up those even more to make them consistent
overall.

This could have been handled in more commits, but since this requires a
make clean before the build, it seemed more sensible to do it all in one.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

mobile-widgets/qml/TextButton.qml

@@ -0,0 +1,37 @@
+import QtQuick 2.3
+
+Rectangle {
+	id: container
+
+	property alias text: label.text
+
+	signal clicked
+
+	width: label.width + 20; height: label.height + 6
+	smooth: true
+	radius: 10
+
+	gradient: Gradient {
+		GradientStop { id: gradientStop; position: 0.0; color: palette.light }
+		GradientStop { position: 1.0; color: palette.button }
+	}
+
+	SystemPalette { id: palette }
+
+	MouseArea {
+		id: mouseArea
+		anchors.fill: parent
+		onClicked: { container.clicked() }
+	}
+
+	Text {
+		id: label
+		anchors.centerIn: parent
+	}
+
+	states: State {
+		name: "pressed"
+		when: mouseArea.pressed
+		PropertyChanges { target: gradientStop; color: palette.dark }
+	}
+}