[Android] New UI : Change colors and globals behaviors

[XilasZ]

New version of the patch, using style and themes.
Some more work is required around the usage of some colors & drawable,
which should not be used directly, i'll do that later.
After that, adding a dark theme would be as simple as adding the neccessary
colors / styles (3 files to change) and change the global theme dynamically.

Execpt audio/video players, everything is now using the new colors.

I'd prefer to not set a background on all *_item.xml layouts to change
selection color. Setting it globally would be better, but i didn't find how
to do it. Also if we change this color, it must be changed everywhere else,
in popup menus too.

I'll push it if you are ok with it.
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