Workspace and AppList Icon Tap/Touch
feedback improvement.

Improves (touch -> first highlight) latency.
Also saves upto 32-48 msecs in launch latencies.

Change-Id: I3ffdb629197489aa359cc1b3b75ebe7d62177d14
Launcher: Show market icon in menu if no space

With the old AOSP paddings the icons look cleanly separated and less
crammed together. In addition, they follow the 48dp touch target
guideline.

Depending on the user's language and screen size/resolution the app &
widget tabs may be too wide for both of the market and overflow buttons
to fit on-screen. To account for cases like these, some code has been
added to overflow the market button to the menu.

Change-Id: I2e7702034151bb6dd6eac5cc42cf4568013f1b7f