Added 105mm boxes and support

Inheritance fixes

Added support for 120-PM-43, because people were complaining way too much that it is forced. Now this addon is optional, but the overall functionality is kept the same.

Added 120mm shells.
The 120mm shells charge is changed by double cliking it in your inventory and selecting the charge you want them to have.

Model optimisation

Fixed shell orientation while firing

Fixed simulation for HEAT shell

Added HEAT round - used in 2B9

Optimised section counts/rvmats

Version bump

Changed prefix from tbd to tbd_mortars - THIS IS A BREAKING CHANGE!
Mods depending on this addon need to be updated.

Minor fixes for labels
Minor functions changes

Fixed compatibility with SOG Prairie Fire DLC.
Added support for SOG Prairie Fire DLC mortars, M29 and Type53

Removed dependency on RHS.
M252 and 2B14 will still work.

Created custom ammunition for mortars.
Smoke shells now produce considerable more smoke, so they are not useless anymore.

Changed the p3d model for ACE Artillery tables