UART refactored (#236)

`Uart` is now an abstract class with a `UartEsp` and a `UartPosix` implementation.

TactilityHeadless/Include/Tactility/hal/uart/Configuration.h

@@ -0,0 +1,40 @@
+#pragma once
+
+namespace tt::hal::uart {
+
+#ifdef ESP_PLATFORM
+
+struct Configuration {
+    /** The unique name for this UART */
+    std::string name;
+    /** The port idenitifier (e.g. UART_NUM_0) */
+    uart_port_t port;
+    /** Receive GPIO pin */
+    gpio_num_t rxPin;
+    /** Transmit GPIO pin */
+    gpio_num_t txPin;
+    /** Read-To-Send GPIO pin */
+    gpio_num_t rtsPin;
+    /** Clear-To-Send Send GPIO pin */
+    gpio_num_t ctsPin;
+    /** Receive buffer size in bytes */
+    unsigned int rxBufferSize;
+    /** Transmit buffer size in bytes */
+    unsigned int txBufferSize;
+    /** Native configuration */
+    uart_config_t config;
+};
+
+
+#else
+
+struct Configuration {
+    /** The unique name for this UART */
+    std::string name;
+    /** Initial baud rate in bits per second */
+    uint32_t baudRate;
+};
+
+#endif
+
+}