Consistent naming: `integer` to represent integer packed in `mrb_value`
instead of `inum`.

`eval` would have crashed in formatting.

It should be lexx than `UINT16_MAX`. If you don't check here, the parser
would raise an exception.

- remove `mrb_jmpbuf` from `codegen_scope`
- unify exception handling of `mrb_state` and `codegen_scope`

- remove `mrb_jmpbuf` from `truct mrb_parser_state`
- unify exception handling of `mrb_state` and `mrb_parser_state`.

Because the current behavior of `__method__` is equivalent to `__callee__`.

Example:

  # example.rb
  def src
    __send__(ARGV[0])
  end
  alias dst src
  %w[src dst].each {|n| puts "call #{n} => #{__send__(n).inspect}"}

  Ruby:

    $ ruby example.rb __method__
    call src => :src
    call dst => :src

    $ ruby example.rb __callee__
    call src => :src
    call dst => :dst

  mruby:

    $ mruby example.rb __method__
    call src => :src
    call dst => :dst

Otherwise `target_class` can be lost when it differs from `proc`'s
`target_class`, e.g. when called from `instance_eval`.

Also we should not pass `target_class` to `MRB_OBJ_ALLOC` since it
checks instance type from the class, and `target_class` may not have
proper information. ref #5272

build(deps): bump github/super-linter from 4.6.3 to 4.7.1

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.6.3 to 4.7.1.
- [Release notes](https://github.com/github/super-linter/releases)
- [Changelog](https://github.com/github/super-linter/blob/master/docs/release-process.md)
- [Commits](https://github.com/github/super-linter/compare/v4.6.3...v4.7.1)

---
updated-dependencies:
- dependency-name: github/super-linter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>

Use gender-neutral pronouns

build(deps): bump github/super-linter from 4.6.2 to 4.6.3

To reduce number of string allocation.

Replace them by `mrb_ensure_string_type()`.

`__to_str` was a mere type check method despite its name.

And merged to `mrb_f_integer()` which is only usage of the function.

* should not raise error for non-string arguments
* avoid allocating case converted string internally

They return the checking argument without modification, so the values
are already there. Maybe we should change the return type to `void` but
keep them unchanged for compatibility.

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.6.2 to 4.6.3.
- [Release notes](https://github.com/github/super-linter/releases)
- [Commits](https://github.com/github/super-linter/compare/v4.6.2...v4.6.3)

---
updated-dependencies:
- dependency-name: github/super-linter
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>

Allow `nil` for `c!` and `I!` specifiers of `mrb_get_args()`

Integrate the processing of similar specifiers of `mrb_get_args()`

It is `o`, `C`, `S`, `A` and `H` specifiers that are integrated.
As a side effect, the `C!` Specifier can now be used.

Refactor the `mrb_get_args()` function

- Removed the `ARGV` macro.
  The current path doesn't go into the mruby VM and there's also no need to separate variables.
- Use common functions to check object types.
  - Use `mrb_ensure_string_type()` to check the string instead of `mrb_to_str()`.
    This is for consistency with array and hash.
  - Use `mrb_ensure_array_type()` to check the array instead of `to_ary()`.
  - Use `mrb_ensure_hash_type()` to check the hash instead of `to_hash()`.
  - Add and use `ensure_class_type()` to check class and module.
- Changed the argument index type from `mrb_int` to `int`.
  Even if it is `int16_t`, it is enough.
  `mrb_int` is overkill, especially if `MRB_32BIT` and `MRB_INT64` are defined.

build(deps): bump github/super-linter from 4.6.1 to 4.6.2