use_graphics=1

@tve I was trying to think of why all the RAM would disappear when the graphics library got included. It'll be the bitmap and vector fonts - specifically:

• https://github.com/espruino/Espruino/blob/master/libs/graphics/bitmap_font_3x5.c
  
• https://github.com/espruino/Espruino/blob/master/libs/graphics/vector_font.h
  
  

Could we maybe have a READ_CONST_UINT8 macro that we can use when accessing data that we think might be in flash memory? On ARM it could default to a normal access, but on ESP8266 it could load 32 bits and shift to get the right byte.

It'd simplify the whole memoryArea thing too.