patch baked file system

[da1nerd]

The nightly builds are failing because IO.write now returns the number of bytes written.
The writer at https://github.com/schovi/baked_file_system/blob/master/src/loader/string_encoder.cr#L20 is not returning the number of bytes.

[da1nerd]

at first glance we could just return slice.size, however, it's not always writing everything in the slice.
Also, I'm not sure what going on here https://github.com/schovi/baked_file_system/blob/master/src/loader/string_encoder.cr#L37

[da1nerd]

this to_s method is deprecated https://github.com/schovi/baked_file_system/blob/master/src/loader/string_encoder.cr#L39.

See https://crystal-lang.org/api/master/Int.html#to_s(base:Int,io:IO,upcase:Bool=false):Nil-instance-method

This is writing the string to the IO as an uppercase. we'll need to count that as well.

[da1nerd]

I think there is some gzip stuff that needs to be updated as well.

[da1nerd]

There's already a PR open for this schovi/baked_file_system#36

[da1nerd]

The core feature that caused this break is being reverted. See crystal-lang/crystal#9469