Print the JSON module graph correctly.

Before, we piggybacked on the implementation of regular soong_build and
wrote a fake build.ninja file to satisfy Ninja.

Now, instead, the JSON module graph is a a separate action in the Ninja
output file. This has the pleasant side effect that one can flip back
and forth between generating the JSON file and regular Soong without
loss of incrementality.

Side cleanup: write .d files in a slightly cleaner way.

Test: Presubmits.
Change-Id: Ia853383567b9dd31c53f3bdf56cfc8d517b498ec