Add tools version of Proguard

This adds a new prebuilt (Proguard 4.7) in the prebuilt/tools
repository which will be distributed with the tools (instead of the
platform version of Proguard in external/. This will allow us to
independently update Proguard intended for tools users without
affecting the platform.

Change-Id: I5f190a27bbc3e219a51d754d258c7c7c5b7750b7
117 files changed
tree: f01c84649eb4ef9728087fc52a4b7a368e065ac3
  1. common/