Added implementations and func codes for MULT, MULTU, DIV, and DIVU
Added the implementation of XOR BITWISE function and the FUNC code for it
Added the FUNC codes for the rest fo the R type implementations
Added implementation for the the rest of R-type instructions, although more clarification is needed for SRA and SRL as they do differ in
their operations bu I dont know how to account for that in C.
Merge pull request #16 from tassiahmed/working

Working