Simple Login Manager Setup

- Created a gui that has buttons and can be completely changed by
changing just a few variables ( marginleft, margintop, buttonsize, gap)
- Added button listeners that listen to button clicks and depending on
which one is clicked, a password variable is updated to show the entered
password - the password field is also updated but its not actually used
- just for the user to look at
- added a backspace button - removes the last character entered
- added an enter button - currently shows the entered password, but it
will later point to the checking function(where the password will be
checked against the database entries of pins to see which employee has
logged in)

- Changed the look and feel to be the default system look and feel -
looks much nicer than the original java theme