[Qt] New Qt bindings

[zeljko]

Hi all,
As of lazarus 0.9.29 svn revision 23858 qt bidings v. 2.1 must be used.
Lazarus qtlcl is not compileable against bindings 1.72 anymore.
Minimum qt libs requirement is qt-4.5.0, but 4.6.XX can be used too.

Den: I've added HAIKU ifdef into qt4.pas, please add it to next version of 
bindings.

Happy coding :)

zeljko