Simple simulation code

Builds a native program on MacOS that runs the NuEVI firmware compiled for x86_64.
Only input is arrow keys for menu buttons for now. Only output is console and display.

Copied some more library files into the simulation folder, and renamed the modified *.cpp files from the libraries to *_sim.cpp.

simulation/include/gfxfont.h

@@ -0,0 +1,29 @@
+// Font structures for newer Adafruit_GFX (1.1 and later).
+// Example fonts are included in 'Fonts' directory.
+// To use a font in your Arduino sketch, #include the corresponding .h
+// file and pass address of GFXfont struct to setFont().  Pass NULL to
+// revert to 'classic' fixed-space bitmap font.
+
+#ifndef _GFXFONT_H_
+#define _GFXFONT_H_
+
+/// Font data stored PER GLYPH
+typedef struct {
+	uint16_t bitmapOffset;     ///< Pointer into GFXfont->bitmap
+	uint8_t  width;            ///< Bitmap dimensions in pixels
+        uint8_t  height;           ///< Bitmap dimensions in pixels
+	uint8_t  xAdvance;         ///< Distance to advance cursor (x axis)
+	int8_t   xOffset;          ///< X dist from cursor pos to UL corner
+        int8_t   yOffset;          ///< Y dist from cursor pos to UL corner
+} GFXglyph;
+
+/// Data stored for FONT AS A WHOLE
+typedef struct { 
+	uint8_t  *bitmap;      ///< Glyph bitmaps, concatenated
+	GFXglyph *glyph;       ///< Glyph array
+	uint8_t   first;       ///< ASCII extents (first char)
+        uint8_t   last;        ///< ASCII extents (last char)
+	uint8_t   yAdvance;    ///< Newline distance (y axis)
+} GFXfont;
+
+#endif // _GFXFONT_H_