Added label values for the buttons in the home screen
Added string constants for the labels for the:
  Matrix
  Determinant
  Rescalc
  Decoder
  Base converter
Buttons
Created the base layout for the main window
Main window now contains a layout for he home screen buttons or
activities. Theming and action bar icons is next
Updated the string for the linear equation system
Updated layouts and strings
layout is being revamped to provide a decent table view.
Updated manifest to make it debuggeable
Updated the main window to draw the ActionBar
Added the action bar overriding method for the Mainwindow class