1.21.0b1

• Always tick mdns in ethernet component esphome#2018 by @flacjacket
• Bump black from 21.6b0 to 21.7b0 esphome#2031 by @dependabot[bot]
• Convert Arduino boolean to bool esphome#2042 by @jesserockz
• Fix ESP32-C3 using v2.0.0-alpha1 support esphome#2035 by @agners
• Bump pylint from 2.8.2 to 2.9.4 esphome#2047 by @dependabot[bot]
• Bump pylint from 2.9.4 to 2.9.5 esphome#2050 by @dependabot[bot]
• Thermostat fixes+updates 1 esphome#2032 by @kbx81
• Add test5 back to CI esphome#2052 by @jesserockz
• Added support for pvvx_mithermometer sensor esphome#1546 by @pasiz (new-integration)
• Added support for Selec Energy Meter esphome#1993 by @sourabhjaiswal (new-integration)
• Add TAG to all compile units esphome#2060 by @agners
• Fix minor build issues with Arduino ESP32 2.0.0-rc1 esphome#2057 by @agners
• Fix clang-format script behaviour without -i + code cleanup esphome#2002 by @oxan
• Merge build flags from platformio_options esphome#1651 by @trvrnrth (breaking-change)
• Print BLE 128-bit UUIDs according to spec esphome#2061 by @agners
• Support library override using named library with repository esphome#2056 by @agners
• Initial ESP32-C3-DevKitM-1 board support esphome#2062 by @agners
• Fix a bunch of typos esphome#2058 by @oxan
• pm1006: add rx-only support esphome#2038 by @Habbie (new-integration)
• Add sensor monetary device_class esphome#2083 by @OttoWinter
• Make light.addressable_set color parameters behave as documented & consistent with elsewhere esphome#2009 by @oxan
• Bump pylint from 2.9.5 to 2.9.6 esphome#2087 by @dependabot[bot]
• Bump ESPAsyncWebServer-esphome to 1.3.0 esphome#2075 by @agners
• Add SDP3x sensor esphome#2064 by @Azimath (new-integration)
• Add support for the TLC5947 24-Channel, 12-Bit PWM LED Driver esphome#2066 by @rnauber (new-integration)
• Add T6615 esphome#1170 by @tylermenezes (new-integration)
• Add support for the HRXL MaxSonar WR series sensors esphome#2020 by @netmikey (new-integration)
• Pull ESP32 Wifi fixes from arduino-esp32 esphome#2069 by @OttoWinter
• Add demo integration esphome#2085 by @OttoWinter (new-integration)
• Add device class support to MQTT cover esphome#2092 by @krconv
• Color mode implementation esphome#2012 by @oxan (notable-change) (breaking-change)
• Convert more code to async-def syntax esphome#2095 by @OttoWinter
• Fix parity bit calculation for ESP8266SoftwareSerial esphome#1873 by @esev (breaking-change)
• Convert sensor_schema to use kwargs esphome#2094 by @OttoWinter
• Fix MQTT light include esphome#2104 by @OttoWinter
• Fix missing include in light_traits.h esphome#2105 by @jkl1337
• Add select entities and implement template select esphome#2067 by @jesserockz (new-integration) (notable-change)
• pmsx003: add standard particle, particle counts esphome#1694 by @warthog9
• Dont force 0 state instead of min_power unless explicit config set esphome#2107 by @jesserockz (breaking-change)
• Fix import esphome#2108 by @jesserockz
• Thermostat enhancements and code clean-up esphome#2073 by @kbx81
• Bump esptool from 2.8 to 3.1 esphome#1839 by @dependabot[bot]
• Add min_save_interval to total_energy/integration for memory wear esphome#1665 by @andreashergert1984
• Add support for Waveshare E-Paper 4.2" B V2 esphome#1610 by @brettp
• Add SM16703 to supported FastLED chipsets esphome#1751 by @robgridley
• Migrate COLOR constants to Color class & disallow implicit conversions to Color esphome#2093 by @oxan
• Add version argument to ESPDEPRECATED macro esphome#2116 by @oxan
• Fix mixup between ColorMode and ColorCapability esphome#2121 by @oxan
• Various follow-up fixes to color mode changes esphome#2118 by @oxan
• Fix crash when using addressable_set with out-of-range indices esphome#2120 by @oxan
• Add state classes to pvvx_mithermometer esphome#2125 by @jesserockz
• Add support for ESP8266 Arduino v3.0.1 esphome#2128 by @oxan
• Drop legacy esphomeyaml command wrapper code esphome#2130 by @oxan
• Allow multiple unnamed libraries esphome#2132 by @agners
• Don't stop effects if brightness goes to zero esphome#2134 by @oxan
• Added support for Hitachi AC424 remote type esphome#2101 by @sourabhjaiswal (new-integration)
• Anova fahrenheit support esphome#2126 by @buxtronix (breaking-change)
• Tidy HA addon esphome#1937 by @jesserockz (breaking-change)
• Removed unused arguments from rgbww code esphome#2137 by @jesserockz
• Only compile protobuf dumping when very verbose logging is enabled esphome#2139 by @oxan
• Refactor clang-tidy script to use actual compiler flags and includes esphome#2133 by @oxan
• Add Toshiba AC generic IR remote protocol esphome#2019 by @kbx81
• Add new Toshiba AC unit protocol esphome#1987 by @kbx81
• Add Dish Network protocol esphome#2117 by @ianchi
• Fix some issues with deprecated argv syntax detection esphome#2127 by @OttoWinter
• Don't discard cold/warm white brightness in constant brightness mode esphome#2136 by @oxan
• Allow entities to be disabled by default in HA esphome#2113 by @jesserockz (new-feature)
• Adds CGPR1 - Qingping Motion & Ambient light sensor support esphome#1675 by @Tommatheussen (new-integration)
• Don't mark COLOR_* constants as static in header esphome#2141 by @oxan
• RFC: status_led: allow to share single light esphome#1974 by @ianchi
• waveshare_epaper: add support for ttgo t5 b74 variant display esphome#1869 by @osresearch
• Thermostat enhancements 2 esphome#2114 by @kbx81 (breaking-change)
• Dsmr component esphome#1881 by @glmnet (new-integration)
• Always abort on allocation when out-of-memory esphome#2129 by @oxan
• Support component tsl2591 esphome#2131 by @wjcarpenter (new-integration)
• Add support for PMSA003i esphome#1501 by @sjtrny (new-integration)
• Increase task wdt timeout for ESP32/ESP32-C3 esphome#2096 by @agners
• Format dev temp idedata esphome#2142 by @OttoWinter
• Add rgbct and color_temperature light platforms esphome#2138 by @jesserockz (new-integration)
• Warn if underscore character is used in hostname esphome#2079 by @davet2001
• Break the Tuya set_datapoint_value method into separate methods per datapoint type esphome#2059 by @nuttytree
• Feature pipsolar anh esphome#1664 by @andreashergert1984 (new-integration)
• Add deassert_rts_dtr option to force RTS/DTR low when using miniterm esphome#2089 by @agners
• Support for AM43 BLE blind motors esphome#1744 by @buxtronix (new-integration)
• Fix format warning in Tuya component esphome#1954 by @agners
• Modular light transformers esphome#2124 by @oxan
• Support for the DKE screen version of LilyGo-TTGO-T5 V2.3 esphome#1969 by @blambov
• Support multiple configuration directories for update-all subcommand esphome#1925 by @oxan