Excessive ArrayList object creation by TileMultipart

[sameer]

Profiling a server with BluePower and QmunityLib mods installed reveals that QmunityLib's TileMultipart.java is creating nearly 90,000 ArrayList objects per second due to method call uk.co.qmunity.lib.tile.TileMultipart.getParts(), as compared to the second highest: ~5,000 from MinecraftForge's ChunkCoordIntPair class.

uk.co.qmunity.lib.tile.TileMultipart.getLightValue() calls getParts() often

TileMultipart needs an internalized ArrayList of parts that is regenerated upon any change to the HashMap<String, IPart> parts.