Bingen refactoring

[boozook]

Could be great to rid of that bunch of files - multiple files for the one SDK version. That kinda ugly.

It may be so:

• vaFormatString => __reserved: usize (Exclude field as unuseful or unimplemented (e.g. for mock) #554)
• pub type va_list => just remove
• generate rustified bindigs for all diffenet targets with all derives (predefined rationalized set: Refactoring bindings: features & derives #550)
• remove derived Copy from all non-enum types (Refactoring bindings: features & derives #550)
• remove derived Clone from all large structs of which contains pointers (Refactoring bindings: features & derives #550)
• feature-gate all derives (just const-ty: Refactoring bindings: features & derives #550)
• compare all enum's repr types, merge into one with cfg-gated repr attr
  • FileOptions and PDButtons are "bitfielded" enum, so enum too,
  • so all enums including "bitfielded" should me merged so way.
• merge it all into one file 🎉