Added numbers ascii

Added the numbers in ascii to core.convert();
Added capital letters ascii
Added lowercase letters ascii

added lowercase letters ascii to existing switch statement
Added convert button to GUI
Changed from GUI form to GUI applet

Instead of running this program on an individual machine, it will now be
able to be run on the web.
Made GUI Applet to JApplet

Changed to JApplet to use swing.
Added main features to GUI
Added results area

Added a results area to the GUI so that the results can be displayed but
not changed.
Added functionality to clear button

Clear button on GUI now clears the main text field and adds a
confirmation message to the results area.