Add length checks to ExtensionCollection

c# feature(RepeatedField): Capacity property to resize the internal array

Remove unused argument to avoid UB

This fixes build on, at least, NetBSD 8.1 with gcc 5.5 and SmartOS with gcc 7.

Java: Update to Guava 28.1-android

Fixed bug in Ruby DSL when no names are defined in a file.

Ported names fix for Ruby to the release branch.

`OneOfDescriptor_each` is registered as a Ruby method which takes zero
parameters, which means it should take one argument.

When Ruby invokes `OneOfDescriptor_each`, it calls it with one parameter
only, which is one less than what `OneOfDescriptor_each` takes before
this commit. Calling a function with the wrong number of argument is
technically undefined behavior.

See also: §6.5.2.2, N1256

Merge 3.10.x with master and increment the version number

* Fix conformance test

Default value of string/message map is not encoded

* Fix zts build

Update CHANGES.txt with changes since 3.10.0-RC1

* Initialize well known type values

Also fixes #6667

* Revert unwanted change

* Initialize well known type values

Also fixes #6667

* Revert unwanted change

This reverts commit 911e3040fa597e6a82351375d9eb416a6d3fae3a.

Currently, the generated header file might cause warnings if user specifies `-Wconversion` compiler option. This commit should be able to fix it.

* Update README.md

Fixed spelling error

* Update README.md

When browsing around the strutil files I found a function
that was never referenced inside the code base
"void StripString(string* s, const char* remove,
-                                 char replacewith);"

The name was kind of misleading as well and it seems like
it's a carbon copy of
"void ReplaceCharacters(string* s, const char* remove,
                                       char replacewith);"
(even the parameter names are the same, the code is the same..)

Is it intentional? Maybe for compatibility reasons? If so,
let's make it deprecated and use the ReplaceCharacters method inside
or the other way around.

Also, noticed there were no tests for "StripString" or "Replace".
Added some for both and planning on maybe making it more C++ish (?)
in another commit.

* Add document for php development

* Fix comments