Tidied up and optimised (replaced imul with shl a few times).

Tidied up code a bit (mostly skeleton...).

Got matrix_mult() working, the whole thing needs optimising/tidying.

Done sum in matrix_mult().

Fixed merge.

Set up loops for mult.

Finished matrix_print().

Can't figure out the array access currently, everything else works in print.

Done nested for loops, time to access the 2D array...

Initial import