Java type generics (#4832)

* Generify, needs some testing and review

* Remove unnecessary change

* Whoops, ? capture that type

* Misread the docs, whoops

* More permissible arithmetic operations

* Implement believed Optimize generics

* Missed a few generics

* More permissible expr for arrays in parameters

* More permissible expr for bitvecs in parameters

* More permissible expr for bools in parameters

* More permissible expr for fps in parameters

* More permissible expr for fprms in parameters

* More permissible expr for ints in parameters

* More permissible expr for reals in parameters

* Undo breaking name conflict due to type erasure; see notes

* Whoops, fix typing of ReExpr

* Sort corrections for Re, Seq

* More permissible expr for regular expressions in parameters

* Fix name conflict between sequences and regular expressions; see notes

* Minor typo, big implications!

* Make Constructor consistent, associate captured types with other unknown capture types for datatype consistency

* More expressive; outputs of multiple datatype definitions are only known to be sort, not capture, and Constructor.of should make a capture

* Be less dumb and just type it a little differently

* Update examples, make sure to type Expr and FuncDecl sort returns

* General fixups

* Downgrade java version, make it only for the generic support, remove var and Expr[]::new construction

* Turns out Java 8 hadn't figured out how to do stream generics yet. Didn't even show up in my IDE, weird

src/api/java/Pattern.java

@@ -36,11 +36,11 @@ public class Pattern extends AST
      * 
      * @throws Z3Exception
      **/
-    public Expr[] getTerms()
+    public Expr<?>[] getTerms()
     {
 
         int n = getNumTerms();
-        Expr[] res = new Expr[n];
+        Expr<?>[] res = new Expr[n];
         for (int i = 0; i < n; i++)
             res[i] = Expr.create(getContext(),
                     Native.getPattern(getContext().nCtx(), getNativeObject(), i));