TArrow: cleanup, added AntiAliasingMode property, published ParentColor, Hint and ShowHint.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41226 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: Improve the header comment in TArrow.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41227 4005530d-fff6-0310-9dd1-cebe43e6787f