Added support for the 'NULL' compression format; a built-in Nitro format that only contains plaintext (but includes the nitro compression header with magic byte 0)
To keep the base program mobile, all native NDS formats do not require plugins.
The 8-bit Huffman format cannot be used to compress at the moment; thanks to CUE a bug has been found where the offset-field of a node overflows, corrupting the compressed file.