handling if user enter wrong hexa format
Error handling in first 4 cases
Error handling for all instructions
fixed bug when there will be a space or tab after label
fixed wrong line numbers
now user can use multi-line comments
fixed bug in debuging sw & lw imme. field
avoiding runtime-error if user typed too many meaningless tokens!
updating no_errors flag at run time error, show line number at unsupported instruction error
Merge pull request #33 from fakhreldin-m-abdelkhalik/assembler

Assembler