Add and apply .editorconfig from P2 (#1195)

* Consistenty use javax annotations.
 - Unfortunately jetbrains annotations seem to be exposed transitively via core somewhere, but with the correct IDE settings, annotations can be defaulted to javax
 - Cleaning up of import order in #1195
 - Must be merged before #1195

* Add and apply .editorconfig from P2
 - Does not rearrange entries

* Address some comments

* add back some javadoc comments

* Address final comments

Co-authored-by: NotMyFault <mc.cache@web.de>

worldedit-cli/src/main/resources/log4j2.xml

@@ -2,13 +2,13 @@
 <Configuration status="WARN" packages="com.sk89q,org.enginehub">
     <Appenders>
         <Console name="SysOut" target="SYSTEM_OUT">
-            <PatternLayout pattern="[%d{HH:mm:ss}] [%t/%level]: %msg%n" />
+            <PatternLayout pattern="[%d{HH:mm:ss}] [%t/%level]: %msg%n"/>
         </Console>
         <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" />
+            <PatternLayout pattern="[%d{HH:mm:ss}] [%t/%level]: %msg%n"/>
             <Policies>
-                <TimeBasedTriggeringPolicy />
-                <OnStartupTriggeringPolicy />
+                <TimeBasedTriggeringPolicy/>
+                <OnStartupTriggeringPolicy/>
             </Policies>
         </RollingRandomAccessFile>
     </Appenders>