Add wESP32 support (#1821)

* Add wESP32 support

* Add default Ethernet config

variants/wesp32/pins_arduino.h

+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+
+#define EXTERNAL_NUM_INTERRUPTS 16
+#define NUM_DIGITAL_PINS        40
+#define NUM_ANALOG_INPUTS       16
+
+#define analogInputToDigitalPin(p)  (((p)<20)?(esp32_adc2gpio[(p)]):-1)
+#define digitalPinToInterrupt(p)    (((p)<40)?(p):-1)
+#define digitalPinHasPWM(p)         (p < 34)
+
+static const uint8_t TX = 1;
+static const uint8_t RX = 3;
+
+static const uint8_t SCL = 4;
+static const uint8_t SDA = 2;
+
+static const uint8_t SS    = 5;
+static const uint8_t MOSI  = 23;
+static const uint8_t MISO  = 32;
+static const uint8_t SCK   = 18;
+
+static const uint8_t A0 = 36;
+static const uint8_t A3 = 39;
+static const uint8_t A4 = 32;
+static const uint8_t A5 = 33;
+static const uint8_t A6 = 34;
+static const uint8_t A7 = 35;
+
+static const uint8_t T0 = 4;
+static const uint8_t T2 = 2;
+static const uint8_t T8 = 33;
+static const uint8_t T9 = 32;
+
+#define ETH_PHY_ADDR  0
+#define ETH_PHY_POWER -1
+#define ETH_PHY_MDC   16
+#define ETH_PHY_MDIO  17
+#define ETH_PHY_TYPE  ETH_PHY_LAN8720
+#define ETH_CLK_MODE ETH_CLOCK_GPIO0_IN
+
+#endif /* Pins_Arduino_h */