ThreadTracker + Attempt on NPC Disappearing fix

Engineered the ThreadTracker: server-embedded deadlock auditing tool, which will print error messages in case of found deadlocks (also showing all in-use locks on the time of the issue).
Changed the player's id on DB now starting from 20mil, thus preventing players from overwriting NPC/mobs with same oid in-game. Requires proper testing to see if the issue has been cleared.

docs/feature_list.txt

@@ -103,5 +103,6 @@ Project:
 * Fixed/added some missing packets for MoveEnvironment, summons and others.
 * Reviewed many Java object aspects that needed concurrency protection.
 * Heavily reviewed future task management inside the project. Way less trivial schedules are spawned now, relieving task overload on the TimerManager.
+* ThreadTracker: embedded auditing tool for run-time deadlock scanning throughout the server source (relies heavily on memory usage, designed only for debugging purposes).
 
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docs/mychanges_ptbr.txt

@@ -669,4 +669,9 @@ Corrigido GM shop sendo liberado pra jogadores em Amherst.
 13 - 14 Novembro 2017,
 Modificado ID de jogador agora começando em 20,000,000, evitando assim clash de id de jogador (que tb representa seu OID) com OIDs de objetos do mapa.
 Nova ferramenta: MapleSkillMakerFetcher. A ferramenta lê info pertinente às descrições de itens feitos pelo Maker e as compila numa tabela, pra ser usada na DB.
-Corrigida questline de mounts e skills de Aran.
+Corrigida questline de mounts e skills de Aran.
+
+15 Novembro 2017,
+Implementado sistema de auditoria de deadlocks: ThreadTracker.
+Corrigido bug onde jogadores recebem dano de mobs de mapas anteriores (que acarretavam em problemas com OID e natureza dos objetos).
+Corrigido alguns problemas com exceção sendo lançada ao tentar desligar o server.