* c++: Add command line option to add extra includes to gen files

Fixes #5351
We have an ability to pass custom types for strings, allocators, etc
but have no way to tell the generator to include the classes in gen code

* c++: remove std::strtok for std::string methods. passes msvc compile

* generate_code.sh: add --cpp-includes to the test gen script

* tests:generate.bat: update code gen scripts w/ --cpp-includes

* cpp: use command line parsing for extra includes

s/--cpp-includes/--cpp-include/g
Simplify command line parsing of includes by using a std::vector.

* cpp: idl.h: move std::vector for cpp_includes as the last member

msvc does not understand initalization list on our CI server

* cpp:msvc: CI fails on for-range loops

* cpp:codegen: fix error reporting on flatcc

* as per code review: remove unwated --cpp-include in the
tests/generate_code.{sh,bat}

This is done on purpose, to avoid API version mismatches that
can cause bad decoding results, see:
https://github.com/google/flatbuffers/issues/5368

Change-Id: I2c857438377e080caad0e2d8bcc758c9b19bd6ec

Change-Id: I7f1f12f2f97e5227e0dabc2965ce66a6d41c229c

add an assert to make sure that `key_field` is not a null pointer.

* Fix Undefined behavior for zero length vectors

* Change fix for UBSan

For schema enums with the bit_flags attribute, generate the
corresponding System.FlagsAttribute in generated Csharp code.

Fixes #5357 (regression introduced by #5235)

* Added a cpp  UnPackSizePrefixed<struct_name> generated helper function

Missing helper function added to the cpp API generator for unpacking size prefixed structures

* Added generated test files

* [Go] Make enums into real types, add String()

This changes the generated code for enums: instead of type aliases,
they're now distinct types, allowing for better type-checking. Some
client code may have to be changed to add casts.

Enum types now have a String() method, so they implement fmt.Stringer.

An EnumValues map is now generated, in addition to the existing
EnumNames map, to easily map strings to values.

Generated enum files are now gofmt-clean.

Fixes #5207

* use example.ColorGreen explicitly

* use valid enum value in mutation test, add new test for "invalid" enum

* add length check and comment

Before this commit tests for iterators passed, even if the code inside
the loop has not been executed.

* WIP size prefix support

* Consider size prefix in overloaded variant

* Work on code gen

* Disabled helper functions in code gen

* Enabled helper functions in code gen

* Fix size prefixed test

* Fix bad function call

* Add SIZE_PREFIX_LENGTH

* Fix review comments

* use fixed order for golang imports

* grumble

* Set default CRTReportMode for the `flatc` target

* Add util.cpp to GRPC test target

* Fix path to util.h

- update C++ monster_test::Color to unsigned type
- update Go Color:ubyte in the go_test.go
- add workaround for unsigned enum in java test
- sync generate.bat and generate.sh

-- MSVC2010 doesn't support indexed access to \0-terminator.

* Use a hash table to index existing vtables

This allows for quick deduplication even in situations where there
might be thousands of vtables due to 'combinatoric explosion'.

This fixes issue #5301.

* Refactor 0-offset trimming

* Improve deduplication benchmark

The routine now generates a set of realistic logical layouts and
uses a timer function that randomly picks a layout for each iteration.

The benchmark runs in batches of # of logical layouts = 1, 10, 100, 1000.

(Note that due to alignment, the actual number of vtables is usually slightly
higher.)

- add monster_extra.fbs
- add monsterdata_extra.json

- MonsterExtra table a root table
- add mosterdata_extra.json

* Fix issues with uint64 enums

- hide the implementation of enums from code generators
- fix uint64 the issue in the cpp-generator
- fix #5108
- new tests
- enums with bit_flags attribute should be unsigned

* Refine objectives of EnumDef's FindByValue and ReverseLookup methods

- move EnumDef::ReverseLookup implementation to idl_parser.cpp
- fix typos

* Make the IsUInt64 method private

* Added Clone, Debug and Default

Change-Id: I57ccbe0b9ccbbec65ca04f9db3cbd62243480d92

Change-Id: I402d857eef9f3e5f3765427c5d3b868ed5a3a22e

Change-Id: I716f6b915adfa6682b5d864857abf7d491d788b5

Change-Id: I0c87ad2cf8f8768cf40c5b7abea0add087a5518a