[NEW] File handling functions

mini.h

@@ -228,4 +228,18 @@ const char* tostr(int val);
 void debug(const char *str);
 void pdebug();
 
-uint8_t ascii(const char *str, uint8_t index);
+uint8_t ascii(const char *str, uint8_t index);
+
+void fopen(const char *filename, uint8_t mode=0);
+void fclose();
+
+void fwritei(int value);
+void fwrited(float value);
+void fwrites(const char *value);
+void fwriteb(bool value);
+void fwriteln();
+
+int freadi();
+float freadd();
+const char *freads();
+bool freadb();