v3.2.9_RC3: Fixed issue #8.2, wrong bit-masks caused classifications greater 7 to…

… be wrongly stored in class laszip_point (and subsequently written out wrongly).

v2.2.0: Changed generating_software default value. Changed header class to us…

…e read-only arrays (where the original uses in-place arrays), so the array instances can't be corrupted (set to null or to an array instance with the wrong size). Changing the content (e.g. with Array.Copy) is still possible, though.