Clean up tools/

- Factor out tools/util.py
- Move js/*.py to tools.
- Rewrite tools/format.sh in python.
- Run lint first in travis.

js/flatbufferjs_hack.py

@@ -1,33 +0,0 @@
-#!/usr/bin/env python
-"""
-gn can only run python scripts.
-
-Generates flatbuffer TypeScript code.
-"""
-import subprocess
-import sys
-import os
-import shutil
-
-# TODO(ry) Ideally flatc output files should be written into target_gen_dir, but
-# its difficult to get this working in a way that parcel can resolve their
-# location. (Parcel does not support NODE_PATH.) Therefore this hack: write the
-# generated msg_generated.ts outputs into the js/ folder, and we check them into
-# the repo. Hopefully this hack can be removed at some point. If msg.fps is
-# changed, commit changes to the generated JS file.
-
-src = sys.argv[1]
-dst = sys.argv[2]
-stamp_file = sys.argv[3]
-
-shutil.copyfile(src, dst)
-
-
-def touch(fname):
-    if os.path.exists(fname):
-        os.utime(fname, None)
-    else:
-        open(fname, 'a').close()
-
-
-touch(stamp_file)