add WeatherService, WeatherApplet with hover panel and lock screen widget

shell/applets/WeatherApplet.qml

@@ -0,0 +1,41 @@
+import QtQuick
+import "../services" as S
+
+Column {
+    id: root
+
+    required property color accentColor
+
+    // Weather icon + summary
+    Item {
+        width: parent.width
+        height: 28
+
+        Text {
+            anchors.left: parent.left
+            anchors.leftMargin: 12
+            anchors.verticalCenter: parent.verticalCenter
+            text: S.WeatherService.icon
+            color: root.accentColor
+            font.pixelSize: S.Theme.fontSize + 2
+            font.family: S.Theme.fontFamily
+        }
+    }
+
+    // Forecast details from wttrbar tooltip
+    Text {
+        width: parent.width - 24
+        anchors.horizontalCenter: parent.horizontalCenter
+        text: S.WeatherService.tooltip
+        color: S.Theme.base05
+        font.pixelSize: S.Theme.fontSize - 2
+        font.family: S.Theme.fontFamily
+        wrapMode: Text.WordWrap
+        lineHeight: 1.3
+    }
+
+    Item {
+        width: 1
+        height: 4
+    }
+}