Settings new dashboard - part 2

Introduce the new Dashboard (a grid like presentation of
Settings top categories) per UX specification.

- the Dashboard is composed of "categories" and in each of them
you have "tiles"
- implement a new layout for showing top categories
(DashboardContainerView). This layout basically acts like a
grid
- depending on the device configuration make the grid with 1
column in portrait / 2 colums in landscape (phones) OR 2 columns
in portrait and 3 in landscape (tablets)
- take care of Accounts adding and removing (as it changes the
number of tiles to show)

Also remove all the old code related to Headers

Change-Id: Ie29944132c1b4c3f7b073d5a7d4453b8f5ec19a7

res/values/colors.xml

@@ -15,9 +15,8 @@
 -->
 
 <resources>
-    <color name="background_drawer">@android:color/white</color>
-    <color name="background_drawer_icon">#ffcccccc</color>
-    <color name="background_search_result_icon">#ffcccccc</color>
+    <!-- TODO: remove this as this is temporary. Waiting for the new Assets. -->
+    <color name="temporary_background_icon">#ffcccccc</color>
 
     <color name="black">#000</color>
     <color name="red">#F00</color>
@@ -60,4 +59,6 @@
     <color name="quantum_orange_700">#fff57c00</color>
     <color name="quantum_orange_A200">#ffffab40</color>
     <color name="quantum_orange_A400">#ffff9100</color>
+
+    <color name="dashboard_background_color">#ffe1e1e0</color>
 </resources>

res/values/config.xml

@@ -29,4 +29,7 @@
          very long strings too. -->
     <integer name="maximum_user_dictionary_word_length" translatable="false">48</integer>
 
+    <!-- Dashboard number of columns -->
+    <integer name="dashboard_num_columns">1</integer>
+
 </resources>

res/values/dimens.xml

@@ -84,4 +84,8 @@
     <dimen name="notification_app_icon_badge_margin">4dp</dimen>
     <dimen name="notification_app_settings_divider_height">48dp</dimen>
     <dimen name="zen_mode_dropdown_width">160dp</dimen>
+
+    <!-- Dashboard padding between each tiles within the layout -->
+    <dimen name="dashboard_cell_gap">4dp</dimen>
+
 </resources>