Added I2C support for raspi & first rework of debugging

include/sta/lang.hpp

@@ -95,6 +95,14 @@
 #  define STA_UNREACHABLE() __builtin_unreachable()
 #endif // !STA_UNREACHABLE
 
+/**
+ * @brief A macro for marking code as not implemented. Causes a program to
+ * crash with the appropriate error message if the code is executed.
+ */
+#ifndef STA_NOT_IMPLEMENTED
+#  define STA_NOT_IMPLEMENTED() throw "myFunction is not implemented yet.";
+#endif // !STA_NOT_IMPLEMENTED
+
 /**
  * @brief Silencing compiler warnings for intended switch case fallthrough.
  *