Refactor HInterfaceBox and SignIn page

- Cleaned up code
- Sizes are standardized
- New HCheckBox component
- Replace RememberAccount page by a checkbox on the SignIn page
- The page can now be flicked if it's not tall enough to display
  everything

- HNumberAnimation now has an overshoot property that will set the right
  easing type, overshoot and adapt the animation factor/duration.
- HImage can now be colorized

src/icons/light-thin/check-mark.svg

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="24"
+   height="24"
+   fill-rule="evenodd"
+   clip-rule="evenodd"
+   version="1.1"
+   id="svg4"
+   sodipodi:docname="check-mark.svg"
+   inkscape:version="">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="640"
+     inkscape:window-height="480"
+     id="namedview6"
+     showgrid="false"
+     inkscape:zoom="9.8333333"
+     inkscape:cx="-7.6779661"
+     inkscape:cy="12"
+     inkscape:current-layer="svg4" />
+  <path
+     d="M21 6.285l-11.16 12.733-6.84-6.018 1.319-1.49 5.341 4.686 9.865-11.196 1.475 1.285z"
+     id="path2"
+     style="fill:#ffffff;fill-opacity:1" />
+</svg>