Implement simple listctrl methods in wxQT
Refactory the list ctrl signal handler
Implemented column getter and setter in listctrl
Fix row colours (fg/bg) in wxQT list ctrl
Fix font in listctrl row
Refactor get Qt list ctrl item to its own method
Implemented item text setter and getter
Refactor qt list item handling (check if not null)
Implement item data in wxQT list control
Implemented items and column deletion in wxQT list ctrl
Implemented item state getter and setter in wxQT list ctrl
Implement get next list item (adapted from generic) in wxQT
Implement item & subitem rect/pos in wxQT list ctrl
Implemented several minor auxiliar list ctrl methods

 * get selected item count
 * count per page (aproximate)
 * visible rect (aproximate)
 * item position
 * ensure visible (using scroll)
 * edit label (some glitches, maybe it should use editItem)
 * scroll dx / dy (aproximate)
 * hit test (only item and nowhere)
Implemented list item find (by string and data) in wxQT