Improvements to Java analysis

General improvements

Path explanations have been added to the relevant security queries. Use QL for Eclipse to run queries and explore the data flow in results.

Query	Tags	Purpose
Arbitrary file write during archive extraction ("Zip Slip") (`java/zipslip`)	security, external/cwe/cwe-022	Identifies extraction routines that allow arbitrary file overwrite vulnerabilities. Results are shown on LGTM by default.
Missing catch of NumberFormatException (`java/uncaught-number-format-exception`)	reliability, external/cwe/cwe-248	Finds calls to `Integer.parseInt` and similar string-to-number conversions that might raise a `NumberFormatException` without a corresponding `catch`-clause. Results are hidden on LGTM by default.

Query	Expected impact	Change
Array index out of bounds (`java/index-out-of-bounds`)	Fewer false positive results	Results for arrays with a length evenly divisible by 3, or some greater number, and an index being increased with a similar stride length are no longer reported.
Confusing overloading of methods (`java/confusing-method-signature`)	Fewer false positive results	A correction to the inheritance relation ensures that spurious results on certain generic classes no longer occur.
Query built from user-controlled sources (`java/sql-injection`)	More results	SQL injection sinks from the Spring JDBC, MyBatis, and Hibernate frameworks are now reported.
Query built without neutralizing special characters (`java/concatenated-sql-query`)	More results	SQL injection sinks from the Spring JDBC, MyBatis, and Hibernate frameworks are now reported.
Unreachable catch clause (`java/unreachable-catch-clause`)	Fewer false positive results	Now accounts for calls to generic methods that throw generic exceptions.
Useless comparison test (`java/constant-comparison`)	Fewer false positive results	Constant comparisons guarding `java.util.ConcurrentModificationException` are no longer reported, as they are intended to always be false in the absence of API misuse.

The class ControlFlowNode (and by extension BasicBlock) has until now been directly equatable to Expr and Stmt. Exploiting these equalities, for example by using casts, is now deprecated, and the conversions Expr.getControlFlowNode() and Stmt.getControlFlowNode() should be used instead.
The default set of taint sources in the FlowSources library is extended to cover parameters annotated with Spring framework annotations indicating remote user input from servlets. This affects all security queries, which will yield additional results on projects that use the Spring Web framework.
The ParityAnalysis library is replaced with the more general ModulusAnalysis library, which improves the range analysis.