Made GMP optional, notice thrown if missing, error thrown only when 64-bit value is actually encountered
Made GMP optional, notice thrown if missing, error thrown only when 64-bit value is actually encountered

For the Minecraft files I’m working with, there aren’t any 64-bit
values, so no need to install GMP and no need to restrict running of
the code.

Fernando-Marquardt/PHP-NBT-Decoder-Encoder,TheFrozenFire/PHP-NBT-Decoder-Encoder