Implement HAL and apply macros across code-base

Implement AVR Platform

Marlin/dac_dac084s085.h

@@ -0,0 +1,11 @@
+#ifndef dac084s085_h
+#define dac084s085_h
+
+class dac084s085 {
+  public:
+    dac084s085();
+    static void begin(void);
+    static void setValue(uint8_t channel, uint8_t value);
+};
+
+#endif //dac084s085_h