Set minSdk back to 3. This removes support for screen density settings.

Set back minSdK to 3. Removes tablet densities. We need to better
understand how to make this change correctly so Canvas, Balls and
Sprites behave properly.

Change-Id: I22d514866c2b31fd0132c563818e6d94ab67a51d
Update Companion Version to 2.22ai2.

Change-Id: Icecf2daad3064c28a644221143a7e8d190f28b83
Changes the word 'Digit' for 'Character' in the Companion textbox hint