* Rust: Fix Copy and Clone impls for a few generic types

* Add tests for Copy+Clone

* Wrap Copy+Clone checks in a #[test] function

- `--clean-first` runs `clean` target to remove previously generated files
- missed `monster_extra_generated.h` file added to the `flattests` target

- remove not necessary file `monster_test_generated.h` from sample_bfbs.cpp

* Avoid intentional unsigned integer overflow getting caught by sanitizers

* Adapt from suggested compiler compatible solution

* And a third way :)

* Add forceDefaults opt to python Builder

* Add test functions for force_default option for python builder

* Simplify

* Add force default test for UOffsetTFlags

* Annotate getters with @Pure when --java-checkerframework is specified.

Together with @Nullable, this allows users to use static analysis tools
like CheckerFramework to catch NPEs caused by unset fields.

* Don't annotate vector-of-tables item getters with @Nullable.

Since Flatbuffers don't support null items in vectors of tables.

Change-Id: I6fd6283b616c7a39bb878b1610e4ddf6e208fa0a

* byte buffer factory returned buffer is used instead of the requested capacity

* byte buffer factory returned buffer is used instead of the requested capacity

* Comment fix

* Fix C/C++ Create<Type>Direct with sorted vectors

If a struct has a key the vector has to be sorted. To sort the vector
you can't use "const".

* Changes due to code review

* Improve code readability

Change-Id: Iacc0c8513af80a736700e6cbaf513ebdf8e3ac89

In my benchmarks it shows deserialization performance improvements of
around 7%

Empty objects that inherit from Sized would try to access internal
ByteBuffer when Sized::size was called. So we add a single byte in
the empty buffer, so when size() is called it would return 0

Change-Id: I59ff072e526fc63b3215767a4d4a2a8944b65654

Changes the use of `LookupStruct` to `LookupCreateStruct` in
`ParseField` to also detect when collisions happen in namespaces.

Alongside --binary and --json, an additional
switch (--flexbuffers) can be passed to convert
data using FlexBuffers

Fixes build errors from using newer crate versions with an old Rust version.

* Adds XOPEN_SOURCE for PATH_MAX and POSIX 1993 for stat

These are the only two required extension for compilation of
flatbuffers using -std=c++11 instead of gnu++11.

* Sets _XOPEN_SOURCE to 600 and enable POSIX2001 for fseeko

The real position of a string is  calculated by using the indirect() method,
which should be based on parentWidth and not byteWidth, as it was implemented.

We are also fixing the flag BUILDER_FLAG_SHARE_STRINGS on FlexBuffersBuilder
that was set as '1', same value as BUILDER_FLAG_SHARE_KEYS.

* Draft with Array specialization (#5508)

* Array specialization + SFINAE to fold copy-paste (#5508)

* Add implicit specialization of Array<scalar> and Array<struct> (#5508)

- Tag dispatching is used for implicit specialization
- Array<scalar> and Array<struct> have different iterators and accessors
- Array<scalar> and Array<struct> have different Mutate() methods

* Add implicit specialization of Array<scalar> and Array<struct> (#5508)

- Tag dispatching is used for implicit specialization
- Array<scalar> and Array<struct> have different iterators and accessors
- Array<scalar> and Array<struct> have different Mutate() methods

* Java: Added access object for vector of struct and vector of tables.

* Java: Workarounds removed when accessing the union vector.

Fixes warnings caught in:
https://buildkite.com/bazel/flatbuffers/builds/863#cff87e1d-b976-4734-8157-4b6d88c7b5e1

Change-Id: Ie94386ff8e10fd2a964bd9155139b50953746a37

Change-Id: Ie82abaf178495c4692e7d10be6b4a13f2fa1bee6

* Add element size parameter to __vector_as_arraysegment

Add element size parameter to __vector_as_arraysegment fixing issue where VectorAsBytes returns incorrect size span for multibyte element types.

* Update codegen

Update codegen and Table to return typed span.

* update test files

update test files

Also add a FlexBuffer constructor to simplify usage

Together with @Nullable, this allows users to use static analysis tools
like CheckerFramework to catch NPEs caused by unset fields.

* fix: segment fault with empty namespace when generating dart file

* fix: compile err

* fix: compile err

* fix: imported file names

* fix test issues

* fix some language style issues

* Cargo clippy lints

* more lints

* more lints

* Restored a doc comment

* Comment on float eps-eq and adjusted casting

* wrap quotes to enum name map to prevent syntax errorn when enum value is negative

* Add a test that covers signed enum case

* [C#] Fix retrieving enumeration vectors as arrays

* [C#] Don't generate CreateVectorBlock for enums

Use all of the available space in the buffer returned by ByteBufferFactory to allow the factory to keep a pool of larger than initialsize sized buffers. (#5500)

* [FlexBuffers][Java] Implementation of FlexBuffers API

This is the initial attemp to implement FlexBuffer on Java.

There is some limitations as compared to the C++ implementation:
  1 - No mutations implemented yet
  2 - Does not parse from json

Also, this initial implementation is not focused and performance, but
get the basics write. So there is many opportunities for optimization, for instance,
remove all enums, return CharSequence instead of Strings and object pooling.

* [FlexBuffers][Java] Optimizations and simplification of the Builder  API.

This change removes BitWidth enum in favor of static ints. Also
make all "reads" APIs closer to C++ implementation (try to cast or convert
as much as possible, assuming user knows what he is doing). Finally,
we remove the helper classes for building vectors and maps.

There is no official benchmarks, but the unit tests are running in less
than 50% for previous runs, which mean those optimizations are worth it.

* [FlexBuffers][Java] Fix Reference::asString behavior

There was a incorrect assumption that strings would be null-terminated, which
could lead to truncated strings. S now it relies size instead of null-termination.

Other minor improvements

Change-Id: Ib771bfa46ccdf38eff25be857b1b73f8b300c649