Rust bindings for COM

Some crates to deal with COM

• com-types

  Re-exports the individual com type crates for publishing.

• com-core

  Idiomatic Rust bindings for core COM.

  State: 20% - WIP.

• com-sys

  Macros and Traits for defining the COM FFI bits.

  State: 95% - This is fine. Changes, if any, will be minor.