Added the MinefieldView class and extra joining and debug code

- The MinefieldView is the equivilent of MinefieldPanel (from swing)
- Modified the activity's layout to add this view
- Modified drawCharacter to use the centre of the
- Removed unnessesary "forText" argument from createPaint
Removed unnessesary MouseEvent code

- Using GestureDetector to detect panning now
Added basic tapping to MinefieldView
Fixed character drawing (mostly) in MinefieldView
Modified the zooming in ZoomView to zoom into the focus point