Added I2C support for raspi & first rework of debugging

include/sta/bus/uart/uart.hpp

@@ -0,0 +1,25 @@
+#ifndef STA_CORE_UART_UART_HPP
+#define STA_CORE_UART_UART_HPP
+
+#include <sta/bus/interface.hpp>
+#include <sta/bus/uart/settings.hpp>
+
+namespace sta
+{
+    class UART : public Interface
+    {
+    public:
+        UART(const UARTSettings & settings, Mutex * mutex=nullptr);
+
+        /**
+         * @brief Get %UART interface settings.
+         * 
+         * @return %UART settings 
+         */
+        const UARTSettings & settings();
+    private:
+        UARTSettings settings_;  /**< %UART settings */
+    };
+} // namespace sta
+
+#endif // STA_CORE_UART_UART_HPP