Added new main form

Added a new main form that should be used to display the current game
Changed form on program start

Changed the form that is displayed during programm start
Designer protections

Added try and catch to prevent issues with the visual studio designer
Fixed calculation error

Bug in the method that draws the figures and the selected fields
Added empty constructor

Added empty constructor and serializable attr. to prevent issues with
the visual studio designer
New game function resets current values

The new game function resets the current bitboard