More automatic codegen

[kenz-gelsoft]

Items noticed in #119

Treatment on these should reduce lines of https://github.com/kenz-gelsoft/wxRust2/blob/main/doxybindgen.toml (and result fewer work to generate more/new classes/APIs)

• [ ] Block ctor on abstract class
• [ ] Block methods using template in args
  • This may be handled wiith hand-written binding, should place comment in generated code?
• [ ] Block operator overloads (which isn't supported yet)
  • [ ] Register an issue with this if block this automatically
• [ ] Block using wx-value types without pointer/ref (which isn't supported yet, or cannot be done automatically)
  • [ ] Register an issue with this if block this automatically