* add nexa remote support.
This is inspired by: https://github.com/sui77/rc-switch/pull/124
As described there: "The remotes sold in ClasOhlson in scandinavia have
a slightly longer sync sequence(added a skip pulse field in the
protocol) and a 64 bit code word. Part of the code gets lost but that
seems to be OK until support for 64 bit codes is added."
* add default value to ctor
* allow 64bit codes
* lint
* make vars 64 bits
* Adding bitmask to narrow compare of received codes
Updated test to add mask configuration
* Lint
* Handle bitmask as ignore characters per review comment
* Fixed test to cover ignore bits
* Lint
* Eliminate separate set_mask method per review comment
## Description:
Move esphome-core codebase into esphome (and a bunch of other refactors). See https://github.com/esphome/feature-requests/issues/97
Yes this is a shit ton of work and no there's no way to automate it :( But it will be worth it 👍
Progress:
- Core support (file copy etc): 80%
- Base Abstractions (light, switch): ~50%
- Integrations: ~10%
- Working? Yes, (but only with ported components).
Other refactors:
- Moves all codegen related stuff into a single class: `esphome.codegen` (imported as `cg`)
- Rework coroutine syntax
- Move from `component/platform.py` to `domain/component.py` structure as with HA
- Move all defaults out of C++ and into config validation.
- Remove `make_...` helpers from Application class. Reason: Merge conflicts with every single new integration.
- Pointer Variables are stored globally instead of locally in setup(). Reason: stack size limit.
Future work:
- Rework const.py - Move all `CONF_...` into a conf class (usage `conf.UPDATE_INTERVAL` vs `CONF_UPDATE_INTERVAL`). Reason: Less convoluted import block
- Enable loading from `custom_components` folder.
**Related issue (if applicable):** https://github.com/esphome/feature-requests/issues/97
**Pull request in [esphome-docs](https://github.com/esphome/esphome-docs) with documentation (if applicable):** esphome/esphome-docs#<esphome-docs PR number goes here>
## Checklist:
- [ ] The code change is tested and works locally.
- [ ] Tests have been added to verify that the new code works (under `tests/` folder).
If user exposed functionality or configuration variables are added/changed:
- [ ] Documentation added/updated in [esphomedocs](https://github.com/OttoWinter/esphomedocs).
