Updating Iterators to be compatible with C++17 in MSVC

Revert "Fix Ruby module name generation when the ruby_package option is used"

This reverts commit 9638dcc3.

* fix module name generation and add tests

* fix existing tests

* support both package name styles

* add check for overflow

* de-nestify

* break long lines

* let repeated fields push arrays

* add varargs push

* better test

* Fix construction of messages using the C++ Python implementation when a map field is passed from one message to another.

* Add a test on message map field construction

* python 3 support

* review comments

* add test

* Collapse code into one

Added Optional GRPC library to third party docs

down integration from internal

* Fix #5513

* Added tests for invalid lengths when reading strings and bytes.
Added test for reading tags with invalid wire types in unknown field set.
Changed invalid length check in ReadString to match the one in ReadBytes

We need to cast to a constant charpointer here.

* fix macos build by changing xcode version

* add comments

* fix benchmark build for mac

* fix for gem option and install npm

* add test for node and npm

* fix node

* fix for node

* another attempts to fix node

* another attempts

* clean up

That should be only on the CFlags. When using the compiler
as the linker driver, one may want to also call pkg-config to get the
cflags, but when invoking the linker, there should be no compiler flags.

Currently, downstream libraries such as RProtoBuf fail because
`-std=c++11` is required via `configure.ac`, but RProtobuf has no way
of knowing this by consulting `pkg-config --cflags protobuf`.

Signed-off-by: Xiang Dai <764524258@qq.com>

* Support rc version in update_version.py

* Exclude repeated and map fields from normalization

* Remove erroneous comments

* Remove unnecessary check for map type

* Add support for repeated/map fields, add tests

* Fix wrapper message in repeated/map fields in array constructor

* Address PR comments

* Removed unused code

* Update docs

Revert "Add stack overflow protection for text format"

This reverts commit 6dcd8109.

This performance optimization allows to skip reflection (in the is() method) when the message has been already unpacked once

* Modify how end tags are encounted in merge code (compiler)

* Modify how end tags are encounted in merge code (generated)

* Modify how end tags are encounted in merge code (library)

* Regenerate generated code through generate_descriptor_proto.sh

I tried finding an active repo on github with no success.  The only ProtoSharp I found wasn't related to PB at all.

* add more descriptive error messages to init methods

* add type errors test to Makefile.am

Document why no enum_extensibility is needed for Swift.