We can now open and read files on the harddisk through a messy virtual filesystem

The uri has to contain 8.3 filenames for now as I have not yet figured out
how to convert from that to regular filenaming for the name comparison.

reading files is still limited to 1 sector

CoreLib/Memory.cpp

@@ -32,7 +32,7 @@ int memcmp( const void* ptr1, const void* ptr2, size_t num)
 
 }
 
-void memcpy (void* dest, const void* src, size_t count ){
+[[maybe_unused]] void memcpy (void* dest, const void* src, size_t count ){
     for( int i = 0; i < count; i++){
         ((char *)dest)[i] = ((const char*)src)[i];
     }