Change crate name and versioning

[kenz-gelsoft]

For crates.io publish:

• Crate names
  • Since wx crate name is already popular for wechat(weixin?) SDK
  • Candidates:
  • wxwidgets
  • wxwidgets-base
• Versioning
  • 0.0.x
  • Since there's no API stability as we map C++ overload to method name
  • Compatible C++ API change may be break compatiblity in this lib

[kenz-gelsoft]

• wxwidgets is a bit too officially.
• wxrust is better.