Add WLED support (#1092)

A component to support [WLED](https://github.com/Aircoookie/WLED/wiki/UDP-Realtime-Control).
This allows to control addressable LEDs over WiFi/UDP, by pushing data right into LEDs.

The most useful to use [Prismatik](https://github.com/psieg/Lightpack) to create
an immersive effect on PC.

It supports all WLED protocols:
- WARLS
- DRGB
- DRGBW
- DNRGB
- WLED Notifier

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

esphome/components/wled/__init__.py

@@ -0,0 +1,20 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components.light.types import AddressableLightEffect
+from esphome.components.light.effects import register_addressable_effect
+from esphome.const import CONF_NAME, CONF_PORT
+
+wled_ns = cg.esphome_ns.namespace('wled')
+WLEDLightEffect = wled_ns.class_('WLEDLightEffect', AddressableLightEffect)
+
+CONFIG_SCHEMA = cv.Schema({})
+
+
+@register_addressable_effect('wled', WLEDLightEffect, "WLED", {
+    cv.Optional(CONF_PORT, default=21324): cv.port,
+})
+def wled_light_effect_to_code(config, effect_id):
+    effect = cg.new_Pvariable(effect_id, config[CONF_NAME])
+    cg.add(effect.set_port(config[CONF_PORT]))
+
+    yield effect