Import panel:

- added pskl.controller.settings.ImportController (empty atm)
- moved SettingsController under settings namespace
- move settings templates in a dedicated folder
- created import icon (svg is in the resources folder)
- added import button in right-layer

templates/settings/export-gif.html

@@ -0,0 +1,17 @@
+<div class="settings-section">
+  <div class="settings-title">
+    Export to Animated GIF
+  </div>
+  <div class="settings-item">
+    <label>Select resolution:</label>
+    <form action="" method="POST" name="gif-export-upload-form">
+      <script type="text/template" id="export-gif-radio-template">
+          <label style="display:block"><input type="radio" name="gif-dpi" value="{{value}}"/>
+          {{label}}</label>
+      </script>
+      <div class="gif-export-radio-group"></div>
+      <input type="submit" class="export-gif-upload-button" value="Upload" />
+    </form>
+    <div class="export-gif-preview"><div></div></div>
+  </div>
+</div>