Implement Memmory Operations Functions
Authors: Haine/Goncalves

Functions added:
INVERT
! STORE
@ FETCH
c! STOREBYTE
c@ FETCHBYTE
Merge branch 'master' of github.com:M2IHP13-commiters/JonesForth-arm
Merge pull request #7 from M2IHP13-commiters/master

Implement Memory Operations