Lots of bug fixes! Everything from I2C to fixed simplewifi and simplewifi-rpc examples.
- Fixed I2C code and verified on hardware
- Defaults to ESP IDF v4.0 for the examples
- Added example docker
- Fixed simplewifi (though ORC and async can still be iffy)
- Fixed simplewifi-rpc
- Fixed example client simplewifi-rpc
- Updated main Readme, and example Readme's