Modify framebuffer and NGA framebuffer to read screen size from board model dtb file. Optimise memory usuage of frame buffer Add example minigui application with hooks to profiler (which writes results to S:\). Modified NGA framebuffer to run its own dfc queue at high priority

#ifndef QEMU_LOG_H
#define QEMU_LOG_H

extern FILE *logfile;
extern int loglevel;

#endif