Fixes issues #2 and #3. Changes include:
1. Added Scrollview so that the text in input textview scrolls
automatically
2. Added Clear button to clear input text
3. Added checkbox to enable or disable autoscroll
4. Added checkbox to enable or disable reading input. Figured this would
be useful if someone wants to copy something from the text view
5. Added settings option for number of characters in the buffer. This
defaults to 50000 characters
6. Layout changes
Fixes issue #1. Changed the textview to monospace so that it displays text
better