Implemented new driver projects (#210)

Moved drivers from the `Boards` projects to `Drivers` folder:
- BQ24295
- AW9523
- AXP2101

The I2C drivers are theoretically cross-platform, but for now they are only built for ESP32.

Drivers/AXP2101/Source/Axp2101.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <Tactility/hal/i2c/I2cDevice.h>
+
+#define AXP2101_ADDRESS 0x34
+
+/**
+ * References:
+ * - https://github.com/m5stack/M5Unified/blob/master/src/utility/AXP2101_Class.cpp
+ * - http://file.whycan.com/files/members/6736/AXP2101_Datasheet_V1.0_en_3832.pdf
+ */
+class Axp2101 final : public tt::hal::i2c::I2cDevice {
+
+public:
+
+    enum ChargeStatus {
+        CHARGE_STATUS_CHARGING = 0b01,
+        CHARGE_STATUS_DISCHARGING = 0b10,
+        CHARGE_STATUS_STANDBY = 0b00
+    };
+
+    explicit Axp2101(i2c_port_t port) : I2cDevice(port, AXP2101_ADDRESS) {}
+
+    std::string getName() const final { return "AXP2101"; }
+    std::string getDescription() const final { return "Power management with I2C interface."; }
+
+    bool setRegisters(uint8_t* bytePairs, size_t bytePairsSize) const;
+
+    bool getBatteryVoltage(float& vbatMillis) const;
+    bool getChargeStatus(ChargeStatus& status) const;
+    bool isChargingEnabled(bool& enabled) const;
+    bool setChargingEnabled(bool enabled) const;
+
+    bool isVBus() const;
+    bool getVBusVoltage(float& out) const;
+};