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A few tests are examining code locations and looking af the resulting line
numbers to verify that GoogleTest shows those to users correctly. Some of those
locations change when clang-format is run. For those locations, I've wrapped
portions in:
// clang-format off
...
// clang-format on

There may be other locations that are currently not tickled by running
clang-format.

PiperOrigin-RevId: 434844712
Change-Id: I3a9f0a6f39eff741c576b6de389bef9b1d11139d

This reverts commit 298a40f0.

This reverts commit a909becd.

Added various conditional compliations for ESP8266 to stub out
missing functionality.

Added support for ESP8266 Arduino platform.

Refactored Arduino defines to use the GTEST_OS_* model.

Added setup()/loop() functions back to *_main.cc files to support compiling in CI.  Future features could enable this for the end user.

Improved flexibility by removing the Arduino entry points in favor of manual calls to setup/loop that the user can call from their entry point.  This is the more common use case for Arudino.

Also added the gtest/gmock_main files to the PlatformIO ignore list since we are not supporting that feature.

Comments changes, no functionality changes

Formatting changes,small cleanup,  no functionality changes