Cursor visual

[Atrixsanna]

Implementing a custom cursor visual to show where the cursor currently is. Handling of the custom cursor should be implemented in a separate class.

• Create a function to paint the cursor on a specific battlefield position.
• Create a function to remove the cursor.
• Create properties to calculate the cursor position relative to the battlefield playfield (row,column) positions (using the battlefield).
• Create properties to store the cursor location in actual console character positions (left, top).

[Atrixsanna]

A basic cursor already exists (BattleField.SelectedPosition), however it could be implemented more nicely as a class and perhaps have a more thought-through look.