Added skeleton of menu
Added possibility to start a new game and load options with some problems
Added save button and changed displaying options
Removed unnecessary lines
Added working authors button in the menu
Added loading file with option of file selection. Throws exception (does not work properly)
adjusting Bridge, CounterGui and SapperGui to match save and load code
merging from Issue_#57
SapperGui BoardAndCounter and Counter update to match changes in Save