Update mk6mortar as mortar framework

[bux]

To easily get compatibility with third party mods (e.g. RHS/CUP/Iron front/...) to use the more realistic approach we took with the mk6 mortar

[PabstMirror]

Rangetables are fairly easy to make generic.
The problem with mortars in arma is they don't shoot how they say they will.

We have to

• Modify the TurretInfoDisplay to hide the bad data
• Figure how how they actually shoot, based on where the camera is looking, ground level...
• Modify the display to show the real data

So it's not just some quick config changes, it requires code running to update the displays.
I can try to think about ways to make it easier to port.