Move every test to a method on DenoTestCase.
test.py is a single TestSuite of every TestCase.
Add a Spawn context manager for http_server,
this is explicitly used where it's needed.
Each python test file can now be run independently
without needing to manually run http_server.
Add --help and consistent flags using argparse for
each python test, including --failfast.
Use ColorTextTestRunner so that '... ok' is green.
This is to ensure a more fair test. Also we were already downloading
from the internet since we changed the URL to use std@v0.5.0. This
change exposes an OOM bug, which is then fixed in the upcoming compiler
refactor by changing checkJs compiler option to false.
