move some optional packages to new repository

Preview/build/debug/README.md

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+# Preview
+
+Image and PDF file viewer for antOS

Preview/build/debug/main.css

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+
+
+afx-app-window[data-id = "preview-win"] afx-vbox[data-id="container"] div[data-id = "view"]
+{
+    display: block;
+    overflow:auto;
+    background-image: url("bg.jpg");
+    background-repeat: repeat;
+}
+
+afx-app-window[data-id = "preview-win"] afx-vbox[data-id="container"] div[data-id = "status"]
+{
+    background-color: transparent;
+    border-top: 1px solid #cbcbcb;
+    padding-left: 10px;
+    padding-top: 3px;
+}
+
+afx-app-window[data-id = "preview-win"] afx-vbox[data-id="container"] canvas{
+    margin-left: auto;
+    margin-right: auto;
+    display: block;
+}
+
+afx-app-window[data-id = "preview-win"] afx-vbox[data-id="container"] div[data-id = "view"].image
+{
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}

Preview/build/debug/package.json

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+{
+    "app":"Preview",
+    "name":"Preview",
+    "description":"Media files viewer",
+    "info":{
+        "author": "Xuan Sang LE",
+        "email": "xsang.le@gmail.com"
+    },
+    "version":"0.0.1-a",
+    "category":"Utils",
+    "iconclass":"fa fa-eye",
+    "mimes":["[^\/]*/.*pdf", "image/.*"]
+}

Preview/build/debug/scheme.html

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+<afx-app-window data-id = "preview-win" apptitle="Preview" width="600" height="400">
+    <afx-vbox data-id = "container">
+        <div data-id="view" ></div>
+        <div data-id = "status" data-height = "20"></div>
+    </afx-vbox>
+</afx-app-window>