Add support for ST7789V display module (as on TTGO T-Display) (#1050)

* TFT-LCD ST7789V of ESP32 TTGO.

This patch allows you to use TFT-LCD ST7789V of ESP32 TTGO

* Lots of polish and a few tweaks

* Add test

* Add color to core, take 1

* Where did those tabs come from?

* Fix lines too long

* Added color component

* Linted

* Rebase, SPI fix, test

* Shuffle bits

* One more thing...oops

* Image type fix...oops

* Make display_buffer use Color

* Fix BGR/RGB, remove predefined colors

* Fix all the things

* renamed colors to color

* migrate max7219

Co-authored-by: musk95 <musk95@naver.com>
Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

esphome/components/st7789v/display.py

@@ -0,0 +1,44 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome import pins
+from esphome.components import display, spi
+from esphome.const import CONF_BACKLIGHT_PIN, CONF_BRIGHTNESS, CONF_CS_PIN, CONF_DC_PIN, CONF_ID, \
+                          CONF_LAMBDA, CONF_RESET_PIN
+from . import st7789v_ns
+
+DEPENDENCIES = ['spi']
+
+ST7789V = st7789v_ns.class_('ST7789V', cg.PollingComponent, spi.SPIDevice,
+                            display.DisplayBuffer)
+ST7789VRef = ST7789V.operator('ref')
+
+CONFIG_SCHEMA = display.FULL_DISPLAY_SCHEMA.extend({
+    cv.GenerateID(): cv.declare_id(ST7789V),
+    cv.Required(CONF_RESET_PIN): pins.gpio_output_pin_schema,
+    cv.Required(CONF_DC_PIN): pins.gpio_output_pin_schema,
+    cv.Required(CONF_CS_PIN): pins.gpio_output_pin_schema,
+    cv.Required(CONF_BACKLIGHT_PIN): pins.gpio_output_pin_schema,
+    cv.Optional(CONF_BRIGHTNESS, default=1.0): cv.percentage,
+}).extend(cv.COMPONENT_SCHEMA).extend(spi.spi_device_schema())
+
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+    yield spi.register_spi_device(var, config)
+
+    dc = yield cg.gpio_pin_expression(config[CONF_DC_PIN])
+    cg.add(var.set_dc_pin(dc))
+
+    reset = yield cg.gpio_pin_expression(config[CONF_RESET_PIN])
+    cg.add(var.set_reset_pin(reset))
+
+    bl = yield cg.gpio_pin_expression(config[CONF_BACKLIGHT_PIN])
+    cg.add(var.set_backlight_pin(bl))
+
+    if CONF_LAMBDA in config:
+        lambda_ = yield cg.process_lambda(
+            config[CONF_LAMBDA], [(display.DisplayBufferRef, 'it')], return_type=cg.void)
+        cg.add(var.set_writer(lambda_))
+
+    yield display.register_display(var, config)