More flexible intent extra parsing.

Specifically, --ei (int extras) and --eia (int[] extras) now
use Integer.decode(), which means they accept negative
integers, base-16 integers formatted as #NNN and 0xNNN, and
base-8 integers formatted as 0NNN.

Additionally, --ez (boolean extras) can now be specified as
"true", "false", "t", "f", or an integer (any nonzero
treated as true). The previous behavior, based on
Boolean.valueOf(), would silently assign false if you
managed to get the spelling of "true" wrong.

Change-Id: I058254e907308006d403b5b7866c86bcaa03d8d3