🏗 Merge C++ into python codebase (#504)

## 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).

esphome/components/fastled_base/__init__.py

@@ -0,0 +1,46 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import light, power_supply
+from esphome.const import CONF_OUTPUT_ID, CONF_NUM_LEDS, CONF_RGB_ORDER, CONF_MAX_REFRESH_RATE, \
+    CONF_POWER_SUPPLY
+from esphome.core import coroutine
+
+fastled_base_ns = cg.esphome_ns.namespace('fastled_base')
+FastLEDLightOutput = fastled_base_ns.class_('FastLEDLightOutput', cg.Component,
+                                            light.AddressableLight)
+
+RGB_ORDERS = [
+    'RGB',
+    'RBG',
+    'GRB',
+    'GBR',
+    'BRG',
+    'BGR',
+]
+
+BASE_SCHEMA = light.ADDRESSABLE_LIGHT_SCHEMA.extend({
+    cv.GenerateID(CONF_OUTPUT_ID): cv.declare_variable_id(FastLEDLightOutput),
+
+    cv.Required(CONF_NUM_LEDS): cv.positive_not_null_int,
+    cv.Optional(CONF_RGB_ORDER): cv.one_of(*RGB_ORDERS, upper=True),
+    cv.Optional(CONF_MAX_REFRESH_RATE): cv.positive_time_period_microseconds,
+
+    cv.Optional(CONF_POWER_SUPPLY): cv.use_variable_id(power_supply.PowerSupply),
+}).extend(cv.COMPONENT_SCHEMA)
+
+
+@coroutine
+def new_fastled_light(config):
+    var = cg.new_Pvariable(config[CONF_OUTPUT_ID])
+    yield cg.register_component(var, config)
+
+    if CONF_MAX_REFRESH_RATE in config:
+        cg.add(var.set_max_refresh_rate(config[CONF_MAX_REFRESH_RATE]))
+
+    if CONF_POWER_SUPPLY in config:
+        var_ = yield cg.get_variable(config[CONF_POWER_SUPPLY])
+        cg.add(var.set_power_supply(var_))
+
+    yield light.register_light(var, config)
+    cg.add_library('FastLED', '3.2.0')
+    yield var