Changes

* Over-striking works properly, minus trying to type something at the very end of the string(most likely a memory leak).

* END button was not working as intended(was going to position 28 instead of 27) in the event strlen was 27 [FIXED].

* Memory leak was a result of right arrow and overstike mode allowing strOffset to get too high, (maxStringLength - 1),

proper max is (maxStringLength - fieldLength - 1).

* Fixed END key for the third time. It's strOffset went too far and allowed typing and such outside of string after hitting end.