rewrite graphics

Author: TomSaw

src/modm/architecture/interface/accessor_flash.hpp

@@ -162,7 +162,7 @@ class Flash
 		return address;
 	}
 
-private:
+protected:
 	const T* address;
 #if MODM_HAS_IOSTREAM
 private:

src/modm/architecture/interface/accessor_ram.hpp

@@ -116,8 +116,8 @@ class Ram
 	{
 		return address;
 	}
-
-private:
+	
+protected:
 	const T* address;
 };