Fix and improve service switching (introduced colors)

- Every service now have its own colors
- Fix bug navigation button and backstack count
- Fix and themed properly the icons and colors of the main fragment tabs
- Re-organized the styles and colors (too much in one file)

app/src/main/res/values/attrs.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <!--TODO: preffix these with "ic_"-->
     <attr name="thumbs_up" format="reference"/>
     <attr name="thumbs_down" format="reference"/>
     <attr name="audio" format="reference"/>
@@ -23,6 +24,8 @@
     <attr name="search_add" format="reference"/>
     <attr name="options" format="reference"/>
     <attr name="play" format="reference"/>
+    <attr name="ic_hot" format="reference"/>
+    <attr name="ic_channel" format="reference"/>
 
     <!-- Can't refer to colors directly into drawable's xml-->
     <attr name="toolbar_shadow_drawable" format="reference"/>