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.h

@@ -7,7 +7,7 @@ void* memset (void* ptr, int value, size_t num);
 
 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 );
 
 size_t strlen(const char* str);