Update Asset Studio launcher and icon generators. Also removes LDPI.

This change updates the Asset Studio launcher icon generator to the new visual
style described in the Android Design guidelines. It also adds XXHDPI icon
creation for launcher icons, which is important for some newer devices such as
Nexus 10.

The change also removes shape selection for notification icons, since this only
affected pre-Gingerbread devices. Pre-Gingerbread icons are still generated,
but they now always have a square shape for simplicity.

Finally, this change removes LDPI for all icon generators. LDPI is much less
relevant today than it was a few years ago, and allowing platform scaling
of MDPI resources is normally an acceptable alternative to providing LDPI
specific resources.

Change-Id: I65afc5b38b25170604cf69ba355816288d30d6d5

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