Filesystem Test

Fixed logfile location issue with --path option
Added option "-fs" for generating ZeroFS blocks
Added -b option for assembling binary maps (a collection of literals and
references describing a file)
Gave prepareNatives() more responsibility
Fixed paths in external asm references
Added more debug reporting to "--trace"
Errors are now thrown to the processor for handling
pc and ivt changes restricted to high level modes
Fixed screenshot repetition
TODO: Find a real screenshot key
Partially fixed Events
Added method in FileUtil to sort File[]'s by file size
Now throws proper error if the saves dir is missing
Added method in MultiplexOutputStream to feed an InputStream to an
OutputStream
Moved assembly files to asm/
Created assembly test of filesystem loading
Moved res.bin to local directory for debugging