Ruby bindings for std::optional<> are broken

[peci1]

Environment

• OS Version: Ubuntu 20.04
• Source or binary build?
  source, main branch @ 56b9fcb

Description

The *.i files like Box.i contain a typemap for std::optional<>, but the typemap is not for Ruby - it is for Python. There is no typemap for Ruby.

Steps to reproduce

1. Start ruby irb and follow this interactive session

rb(main):001:0> require 'math'
=> true
irb(main):002:0> v = Gz::Math::CoordinateVector3.new
irb(main):003:0> v.X()
Traceback (most recent call last):
        5: from /usr/bin/irb:23:in `<main>'
        4: from /usr/bin/irb:23:in `load'
        3: from /usr/lib/ruby/gems/2.7.0/gems/irb-1.2.1/exe/irb:11:in `<top (required)>'
        2: from (irb):3
        1: from (irb):3:in `X'
ArgumentError (wrong # of arguments(0 for 1))

This was discussed in #616 (comment) .