#609 AGI Mouse-behaviour

[sterv]

ScummVM should interpret left mouse button as 1, right mouse button as 2, both left and right mousebuttons pressed simultaneously as 3, middle button (scroll wheel) as 4, just like in AGI Mouse, and if possible, support scroll wheel but with mouse only. Values for scroll wheel forward and backward could be 5 and 6.

What ScummVM should not do, is to interpret mousebuttons/wheel usage as keyboard activity like it does now. Restrict mousebuttons ( and scroll wheel) to only variable 27, variable 19 is for keyboard only.