AAPT2: Add support to specify stable IDs

The --stable-ids flag allows the user to specify a file containing
a list of resource name and resource ID pairs in the form of:

package:type/name = 0xPPTTEEEE

This assigns the given resource the specified ID. It helps ensure
that when adding or removing resources, IDs are assigned in a stable
fashion.

If a package, type, or name is not found, no error or warning is
raised.

Change-Id: Ibc2f4e05cc924be255fedd862d835cb5b18d7584