Improvements to Java analysis

General improvements

Query	Tags	Purpose
Double-checked locking is not thread-safe (`java/unsafe-double-checked-locking`)	reliability, correctness, concurrency, external/cwe/cwe-609	Identifies wrong implementations of double-checked locking that does not use the `volatile` keyword.
Race condition in double-checked locking object initialization (`java/unsafe-double-checked-locking-init-order`)	reliability, correctness, concurrency, external/cwe/cwe-609	Identifies wrong implementations of double-checked locking that performs additional initialization after exposing the constructed object.

Query	Expected impact	Change
Arbitrary file write during archive extraction ("Zip Slip") (`java/zipslip`)	Fewer false positive results	Results involving a sanitization step that converts a destination `Path` to a `File` are no longer reported.
Double-checked locking is not thread-safe (`java/unsafe-double-checked-locking`)	Fewer false positive results and more true positive results	Results that use safe publication through a `final` field are no longer reported. Results that initialize immutable types like `String` incorrectly are now reported.
Result of multiplication cast to wider type (`java/integer-multiplication-cast-to-long`)	Fewer results	Results involving conversions to `float` or `double` are no longer reported, as they were almost exclusively false positives.

The deprecated library semmle.code.java.security.DataFlow has been removed. Improved data flow libraries have been available in semmle.code.java.dataflow.DataFlow, semmle.code.java.dataflow.TaintTracking, and semmle.code.java.dataflow.FlowSources since 1.16.
Taint tracking now includes additional default data-flow steps through collections, maps, and iterators. This affects all security queries, which can report more results based on such paths.
The FlowSources and TaintTracking libraries are extended to cover additional remote user input and taint steps from the Apache Thrift, Apache Struts, Guice and Protobuf frameworks. This affects all security queries, which may yield additional results on projects that use these frameworks.