pw_presubmit: Common tools for running presubmits
pw_presubmit: Common tools for running presubmits

pw_presubmit provides a presubmit runner and functions that can be
used to run presubmits in a Git repository.

Change-Id: I556bb6f7b70b66e5df0af7552f9ed41ce9ca08a0

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed