Make aapt ignore tools-related data.

Make aapt ignore tools-related data.

This patchset introduces a new standard namespace http://schemas.android.com/tools
which will be used for tools specific XML attributes.
Any attributes using this namespace will not be compiled into the binary XML file.

The namespace node is also not written at all, and its string is not collected
to ensure that there is no impact on the devices.

(cherry picked from commit a5d5e9d906583ebeb590ca200ca9840302a5cd1a)

Change-Id: I62937b8bc34c07ac544930aa8eadd7797e0179d5