Revert "Revert "ssd1306 2D and font""

This reverts commit fbc486189b.

extras/fonts/fonts.h

@@ -0,0 +1,38 @@
+/*
+ * fonts.h
+ *
+ *  Created on: 8 dec. 2016
+ *      Author: zaltora
+ */
+
+#ifndef FONTS_H
+#define FONTS_H
+
+#include <FreeRTOS.h>
+#include "config.h"
+
+/**
+ * Character descriptor
+ */
+typedef struct _font_char_desc
+{
+    uint8_t width;      //Character width in pixel
+    uint16_t offset;    //Offset of this character in bitmap
+} font_char_desc_t;
+
+/**
+ * Font information
+ */
+typedef struct _font_info
+{
+    uint8_t height;         //Character height in pixel, all characters have same height
+    uint8_t c;              //Simulation of "C" width in TrueType term, the space between adjacent characters
+    char char_start;        //First character
+    char char_end;          //Last character
+    const font_char_desc_t* char_descriptors; //descriptor for each character
+    const uint8_t *bitmap;  //Character bitmap
+} font_info_t;
+
+extern const font_info_t* fonts[NUM_FONTS];  //Built-in fonts
+
+#endif // _FONTS__H_