Add oppressive language presubmit

Also removed some occurrences of "master", though unfortunately we can't
do anything about the `sqlite_master` table name.

BUG=b:162024466
TEST=none

Change-Id: I48576689ec0e5b3ab1e5475f439d70e739225470
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/optofidelity_TPPT_analysis/+/2533721
Tested-by: Harry Cutts <hcutts@chromium.org>
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Sean O'Brien <seobrien@chromium.org>
3 files changed