Big fix to clipboards when relogging/restarting server etc.

- Refactor the way FAWE clipboards work slightly with regards to offsets (FAWE-added) and origin (upstream-present)
 - Better error messages when exceptions are thrown attempting to load DOC
 - No longer attempt to resolve old clipboard versions. Attempt to give informative error instead
 - Don't always delete clipboards held in memory on player logout unless configured to do so
 - Go back to fully closing the DOC on logout. We now attempt to lock the file which will hopefully help with debugging shared clipboard folders

worldedit-core/src/main/java/com/fastasyncworldedit/core/internal/exception/FaweClipboardVersionMismatchException.java

@@ -0,0 +1,11 @@
+package com.fastasyncworldedit.core.internal.exception;
+
+import com.fastasyncworldedit.core.configuration.Caption;
+
+public class FaweClipboardVersionMismatchException extends FaweException {
+
+    public FaweClipboardVersionMismatchException() {
+        super(Caption.of("fawe.error.clipboard.on.disk.version.mismatch"), Type.CLIPBOARD);
+    }
+
+}

worldedit-core/src/main/java/com/fastasyncworldedit/core/internal/exception/FaweException.java

@@ -90,6 +90,7 @@ public class FaweException extends RuntimeException {
         CHUNK,
         PLAYER_ONLY,
         ACTOR_REQUIRED,
+        CLIPBOARD,
         OTHER
     }