Print unicode symbols to console if supported when printing riddle\solution
Prints unicode to console if supported [#6] + minor changes.
Accelerate board creation: dealing with 'avoid_*' flags by changing the way symbols are revealed \ by pruning symbols
Flag for 'create': Add an option to avoid abvious (-) false clues due to long ships
Refactor: remove cvxpy dependency for only loading\displaying riddles
Refactor: Allow loading riddle and solution objects and printing them, without loading cvxpy
Flag for 'create': Add an option to avoid abvious true clues of value 0 in a (+1) segment
Flag for 'create': Add an option to avoid abvious true clues of value (x>0) in a (+1) segment