Object <-> Object collision handling

[sapier]

based on kahrls stairs branch I've added object collision handling. I've only made it fully operational for luaentitys and player objects as items don't need it and c++ mobs are most likely to be removed.
LuaEntities do honor the "pysical" flag, collision handling is only done for physical = true.

It's only a proove of concept some changes need to be considered if there might be better solutions

https://github.com/sapier/minetest/tree/object_object_collision

[dannydark]

Does this require Kahrls collision branch to work?

I will test it later so was just wondering.

[sapier]

this branch is based on kahrls so its already included.

[dannydark]

Ah yeh sorry I didn't see your merge message when I checked earlier haha, just wasn't looking properly.

[sapier]

I've moved the getCollisionBox function from ActiveObject to a separate interface class this will reduce changes necessary