Wither invulnerability
Add log pickups.
Merge pull request #829 from Howaner/Cake

Add log pickups.
Minor fixes
Merge pull request #828 from mc-server/Wither

Wither invulnerability
Ender crystals
Merge pull request #833 from mc-server/EnderCrystal

Ender crystals
InfoReg updated for multi-verb console commands.
Added Vector3::Move(const Vector3 &).
BlockArea: Switched internal coords to Vector3i.
BlockArea: Create() can take the size as Vector3i, too.
Added a basic cPrefab class.

Can be defined in the source by GalExport's cpp output.
Removed unused constants.

DeadlockDetect reads the value from the ini file, and world lighting has a separate queue now.
Ignoring the default GalExports folder.
Prefabs support connectors, rotations and merge strategy.
Fixed chunk neighbor-getting for long distances.

This fixes a server hang when teleporting to coords too far away.
cPrefab can draw itself into a cChunkDesc.