Forward exceptions to log4j, cleanup logger handling. Fixes BUKKIT-4948

By: Travis Watkins <amaranth@ubuntu.com>

paper-server/src/main/resources/log4j2.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN" packages="net.minecraft,com.mojang">
+    <Appenders>
+        <Queue name="TerminalConsole">
+            <PatternLayout pattern="[%d{HH:mm:ss} %level]: %msg%n" />
+        </Queue>
+        <RollingRandomAccessFile name="File" fileName="logs/latest.log" filePattern="logs/%d{yyyy-MM-dd}-%i.log.gz">
+            <PatternLayout pattern="[%d{HH:mm:ss}] [%t/%level]: %msg%n" />
+            <Policies>
+                <TimeBasedTriggeringPolicy />
+                <OnStartupTriggeringPolicy />
+            </Policies>
+        </RollingRandomAccessFile>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <filters>
+                <MarkerFilter marker="NETWORK_PACKETS" onMatch="DENY" onMismatch="NEUTRAL" />
+            </filters>
+            <AppenderRef ref="File"/>
+            <AppenderRef ref="TerminalConsole"/>
+        </Root>
+    </Loggers>
+</Configuration>
+