Tons of client refactorings; better names (expand for details)

TiledUtils -> PlacementUtils
SoundTrackInstrument -> Instrument
SountTrack -> Track
SoundTrackEnvelope -> Envelope
SoundTrackFilter -> Filter
MouseCapturer -> MouseRecorder
SignLink -> Signlink
ChatEncoder -> TextCompressor
CollisionMap -> TraversalMap
BufferedConnection -> SocketBuffer
OnDemandNode -> ArchiveRequest
OnDemandRequester -> OndemandController
Actor -> Mob
NPCDefinition -> NpcDefinition