* go: replace objAPI-generated Pack func with method
See discussion at https://github.com/google/flatbuffers/issues/5668
* go: replace generated union type UnPack func with method
Similar to discussion https://github.com/google/flatbuffers/issues/5668
But signature:
```
func AnyUnPack(t Any, table flatbuffers.Table) *AnyT
```
Becomes,
```
func (rcv Any) UnPack(table flatbuffers.Table) *AnyT
```
* [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
- 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
As recommended by https://golang.org/pkg/cmd/go/internal/generate/:
To convey to humans and machine tools that code is generated,
generated source should have a line early in the file that
matches the following regular expression (in Go syntax):
^// Code generated .* DO NOT EDIT\.$
Similar to what protobufs does with its `Message` interface, introduce here such interface and create a generic `GetRootAs` method to deserialize a flatbuffer.
Implement code generation and runtime library for Go, derived from the
Java implementation. Additionally, the test suite verifies:
- the exact bytes in the Builder buffer during object construction,
- vtable deduplication, and
- table construction, via a fuzzer derived from the C++ implementation.
Change-Id: Ib95a019c684891def2b50281e570b4843fea7baa
