Remove magic grabPoint index logic

[stijnwop]

There are checks all over the place checking if the current index > 1 or the inverted checks.

Fix this by setting the first and last index in the xml. This will also allows it to add more grabPoints.

e.g:

hoseSystem/specializations/HoseSystemPlayerInteractiveHandling.lua

Line 332 in 1f90175

table.insert(grabPoints, index > 1 and self.object.grabPoints[1] or self.object.grabPoints[#self.object.grabPoints])

hoseSystem/specializations/HoseSystemPlayerInteractiveHandling.lua

Line 682 in 1f90175

local moveDir = grabPoint.id > 1 and -1 or 1

Nasty stuff.