[Lazarus] macOS trackpad horz scroll

Alexey aaa5500 at ya.ru
Sat Mar 25 09:43:47 CET 2017

  I wanted this change:
- Carbon WS can read horz mouse wheel. it sends e.g. LM_WHEELSCROLL_HORZ
- LCL generates as usual OnMouseWheel (....Up/Down), but if it is horiz 
wheel move, then
it adds flag ssScrollHorz to Shift parameter.
- app can detect horiz wheel move, by ssScrollHorz

No need to add new events OnMouseWheelHorz, only add item to Shift.
What do you think.

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