Remove Internal Event Dispatcher

[whimxiqal]

• Remove the SearchEventDispatcher and all associated events
• Make Cell record
• Handle path searches directly on platform's (Paper's) available async threads rather than dedicated ones
• Animate only the "success" candidates, now with stained-white glass
• Move animation logic to common library into new AnimationManager
• Move search completion logic to common library in SearchManager
• Return a Future from the SearchManager's in-game launch method
• Move "at surface" evaluation to common library using BlockProvider
• Only send debugging messages to console
• Removed DebugManager and handle debugging directly in logger class
• Cleaned-up extra player-specific class clutter
• Renamed PathTrial -> DestinationPathTrial and AbstractPathTrial -> PathTrial
• Removed unreleased DEDICATED_THREADS config setting
• Better debugging messages
• Changed logging prefix, inspired by Spark
• Better handling of canceled/failed cases in ItineraryTrial
• Better thread-safety