activity_new_game_preferences.xml: Create form with number input fields for user to enter height, width and number of block types
Change string names to match new format
activity_new_game_preferences.xml: Create OK button
activity_new_game_preferences.xml: Add comments for OK button
NewGamePreferencesActivity: On clicking OK button, start the GameActivity and send it the width, height and number of block types
GameActivity: Remove whitespace
IntentExtraReferences: Move to activity package
GameActivity: Retrieve grid data from calling Intent
GameActivity: Use the grid data retrieved from the intent to create the grid