feat(Components): introduce StatusRoundedImage

A component that renders an image as a circle, given some URL.

Usage:

```
StatusRoundedImage {
    image.source: "..." // some url
}
```

Closes #32

sandbox/Others.qml

@@ -17,4 +17,8 @@ GridLayout {
     StatusLetterIdenticon {
         name: "#status"
     }
+
+    StatusRoundedImage {
+        image.source: "https://pbs.twimg.com/profile_images/1369221718338895873/T_5fny6o_400x400.jpg"
+    }
 }

src/StatusQ/Components/StatusRoundedImage.qml

@@ -0,0 +1,31 @@
+import QtQuick 2.13
+import QtGraphicalEffects 1.0
+import StatusQ.Core 0.1
+import StatusQ.Core.Theme 0.1
+
+Rectangle {
+    id: statusRoundImage
+    property alias image: image
+
+    implicitWidth: 40
+    implicitHeight: 40
+    color: "transparent"
+    radius: width / 2
+    layer.enabled: true
+    layer.effect: OpacityMask {
+        maskSource: Rectangle {
+            x: statusRoundImage.x; y: statusRoundImage.y
+            width: statusRoundImage.width
+            height: statusRoundImage.height
+            radius: statusRoundImage.radius
+        }
+    }
+
+    Image {
+        id: image
+        sourceSize.width: parent.implicitWidth
+        sourceSize.height: parent.implicitHeight
+        fillMode: Image.PreserveAspectFit
+        cache: true
+    }
+}

src/StatusQ/Components/qmldir

@@ -2,3 +2,4 @@ module StatusQ.Components
 
 StatusLetterIdenticon 0.1 StatusLetterIdenticon.qml
 StatusLoadingIndicator 0.1 StatusLoadingIndicator.qml
+StatusRoundedImage 0.1 StatusRoundedImage.qml