Created input parser

Created an input parsing system where each cell in an ASCII table
stored in memory contains a pointer to a subroutine to be ran when
that character is given as input.

Created basic routines to echo input to verify the ASCII vector
table worked as intended.
Implemented all features

Implemented the 'A' operator, which stores the value of an inputed
character into VAR_A.

Implemented the 'B' operator, which stores the value of an inputed
character into VAR_B.

Implemented the 'a' operator, which prints VAR_A backwards.

Implemented the 'b' operator, which prints VAR_B backwards.
Merge branch 'develop'