Check for intersection between placed blocks and entities. (#3850)

* Check for intersection between placed blocks and entities.

+ Implemented GetPlacementCollisionBox, to permit custom placement collision boxes for blocks.

* Factored block-entity placement checking into another function in cPlayer.

- Removed vector min/max functions

* Use GetWorld to get the world in DoesPlacingBlocksIntersectEntity.

+ Added block height checks, allow different cEntity subclasses to decide whether they will prevent block placement.

tests/SchematicFileSerializer/Stubs.cpp

@@ -34,6 +34,11 @@ cBlockInfo::cBlockInfoArray::cBlockInfoArray()
 }
 
 
+cBoundingBox::cBoundingBox(double, double, double, double, double, double)
+{
+}
+
+
 
 
 
@@ -45,6 +50,15 @@ cBlockHandler::cBlockHandler(BLOCKTYPE a_BlockType)
 
 
 
+cBoundingBox cBlockHandler::GetPlacementCollisionBox(BLOCKTYPE a_XM, BLOCKTYPE a_XP, BLOCKTYPE a_YM, BLOCKTYPE a_YP, BLOCKTYPE a_ZM, BLOCKTYPE a_ZP)
+{
+	return cBoundingBox(0, 0, 0, 0, 0, 0);
+}
+
+
+
+
+
 bool cBlockHandler::GetPlacementBlockTypeMeta(
 	cChunkInterface & a_ChunkInterface, cPlayer * a_Player,
 	int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace,