- Fixed: A_Die didn't consider missiles for the function.
- Added: A_GiveToChildren

- Added: A_TakeFromChildren
- Added: A_GiveToSiblings
- Added: A_TakeFromSiblings
- Added the following flags for A_RadiusGive:
- RGF_NOSIGHT: Exclude sight check from distance.
- RGF_MISSILES: Missiles can take inventory items.
Merge branch 'experimental' of https://github.com/MajorCooke/zdoom
- fixed RGF_NOSIGHT checking for A_RadiusGive.
- fixed: UDMF ceiling plane properties set the map's floor plane values.