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Due to confusion arisen from "iff" standing for "if and only if",
this commit uses the latter.

Fix documentation links

PiperOrigin-RevId: 258389329

Update a broken link in a comment.

PiperOrigin-RevId: 257493975

Renaming doc files to make the file names more palatable and in preparation for including documentation in sync process

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

TestCase->TestSuite refactoring

PiperOrigin-RevId: 227702164

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.

Internal Change

PiperOrigin-RevId: 227575279

Remove the #ifs for old, unsupported and buggy compilers:
* old versions of GCC & MSVC
* Symbian

PiperOrigin-RevId: 227116941

Internal Change

PiperOrigin-RevId: 225231727

Applied fixes for ClangTidy modernize-use-override and modernize-use-using.

PiperOrigin-RevId: 223800219

Internal Change

PiperOrigin-RevId: 222123106

Move the Matcher<T> interface to googletest so I can use it to extend death test regex matching in a subsequent change.

PiperOrigin-RevId: 221675910

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 219129336

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 218618184

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 218571466

Now that googletest has moved to C++11, it should no longer
use NULL or 0 for the null pointer. This patch converts all
such usages to nullptr using clang-tidy.

This prevents LLVM from issuing -Wzero-as-null-pointer-constant
warnings.

PiperOrigin-RevId: 215814400

more comments changes

Comments changes, no functionality changes

Formatting changes,small cleanup,  no functionality changes

merging, 

...merging

RE-Doing the merge, this time with gcc on mac in the PR so I can catch errors before merging the PR

formatting