Integrate castling and e.p. rights into board array; bugfix for EditPosition

Integrate castling and e.p. rights into board array; bugfix for EditPosition

A large-scale operation that I have been postponing since the very first 4.4.0:
The castling and e.p. rights are now integrated into the board array, as
boards[moveNr][CASTLING][i] replacing castlingRights[moveNr][i] and
boards[moveNr][EP_STATUS] replacing epStatus[moveNr]
These quantities are now automatically copied with the position by CopyBoards
(allowing the removal of lots of dedicated copying code), and passed as
function arguments with the position (so that the moves.c functions like
TestLegality, MateTest, CoordsToAlgebraic, Disambiguate, GenLegal
no longer need explicit e.p. and castling parameters.

Also fixed a bug introduced by a recent previous fix: by adding fake castling
rights to a position set up through the EditPosition menu, I destroyed the
castling rights of a pasted FEN. Faking castling rights is now made conditional
in EditPositionDone(), depending on the caller. (I had not realized it was also
called after FEN pasting, to send the position to the engine.)