Update: Remove the "amount" from file stream functions.

Update: Remove the "amount" from file stream functions.

The "amount" is present to support the parameters that fread() and fwrite() utilize.
This makes no sense to me and it is annoying and confusing.
I end up having to just put 1.

Get rid of it and just use the file.size_read and file.size_write to specify the buffer size to read/write.

The only things that I can thing of might be atomic operations, locking, and calling the function multiple times.
These are good reasons to have an "amount".

If I end up wanting o needing an "amount", I may add additional functions later on.