[6.x.x] Removed finalize() methods

[reinhapa]

Removed all finalize() methods for the following classes:

• exist-core/src/main/java/org/exist/util/GZIPInputSource.java
• exist-core/src/main/java/org/exist/xmldb/AbstractRemoteResource.java
• exist-core/src/main/java/org/exist/xmldb/RemoteResourceSet.java
• exist-core/src/main/java/org/exist/xmlrpc/AbstractCachedResult.java

Remplaced finalize() method with shutdown hook:

• exist-core/src/main/java/org/exist/util/io/TemporaryFileManager.java

Description:

Fixes a SAXParseException that occured in heavy use denoting that the document does missing a needed ending tag or having a premature end of file.