From https://youtu.be/YNSAZIW3EM0?t=1474:
"Hmm... I don't think that name is right! From the perspective of
userspace, this is a file descriptor. File description is what the
kernel internally keeps track of, but as far as userspace is concerned,
he just has a file descriptor. [...] Maybe that name should be changed."
Core::File even has a member of this enum type... called
m_should_close_file_descriptor - so let's just rename it :^)
I originally defined the bytes() method for the String class, because it
made it obvious that it's a span of bytes instead of span of characters.
This commit makes this more consistent by defining a bytes() method when
the type of the span is known to be u8.
Additionaly, the cast operator to Bytes is overloaded for ByteBuffer and
such.
