new block cache and much more...

- more reliable code invalidation detection
- blocks aren't stopped at any branch, but are being followed
if possible to get larger blocks
- idle loop recognition
- optimised literal loads, load/store cycle counting
 and loads/stores from constant addresses

src/Config.h

@@ -49,6 +49,7 @@ extern int GL_Antialias;
 #ifdef JIT_ENABLED
 extern bool JIT_Enable;
 extern int JIT_MaxBlockSize;
+extern bool JIT_BrancheOptimisations;
 #endif
 
 }