HALO: hdpi & mdpi icon update

time to refresh these outdated icons

Conflicts:
	packages/SystemUI/res/drawable-hdpi/halo_back_left.png
	packages/SystemUI/res/drawable-hdpi/halo_back_right.png
	packages/SystemUI/res/drawable-hdpi/halo_bg.png
	packages/SystemUI/res/drawable-hdpi/halo_bigred.png
	packages/SystemUI/res/drawable-hdpi/halo_black_x.png
	packages/SystemUI/res/drawable-hdpi/halo_clear_all.png
	packages/SystemUI/res/drawable-hdpi/halo_dismiss.png
	packages/SystemUI/res/drawable-hdpi/halo_marker.png
	packages/SystemUI/res/drawable-hdpi/halo_marker_b.png
	packages/SystemUI/res/drawable-hdpi/halo_marker_t.png
	packages/SystemUI/res/drawable-hdpi/halo_x.png
	packages/SystemUI/res/drawable-hdpi/ic_notify_halo_normal.png
	packages/SystemUI/res/drawable-hdpi/ic_notify_halo_pressed.png
	packages/SystemUI/res/drawable-mdpi/halo_bg.png
	packages/SystemUI/res/drawable-mdpi/halo_clear_all.png
	packages/SystemUI/res/drawable-mdpi/halo_marker.png