Add endstops, light_sensor, test, many fixes

- Added endstop and light_sensor module
 - Improved configuration by splitting wiring configs to boards.h
 - Added a unit test for argument parsing
 - Fixed many smaller bugs

src/dummyEEPROM.h

@@ -0,0 +1,24 @@
+
+#include <stdint.h>
+
+struct EEPROMClass
+{
+    //Basic user access methods.
+    uint8_t read(int idx) { return -1; }
+    void write(int idx, uint8_t val) { return; }
+    void update(int idx, uint8_t val) { return; }
+
+    template <typename T>
+    T &get(int idx, T &t)
+    {
+        return t;
+    }
+
+    template <typename T>
+    const T &put(int idx, const T &t)
+    {
+        return t;
+    }
+};
+
+static EEPROMClass EEPROM;