revamp and simplify swig support, force typed enums for C# and Java for all except the constraint_solver/routing module; port examples; Fix SAT on very large problems

ortools/constraint_solver/python/constraint_solver.i

@@ -31,7 +31,7 @@
 // - examples/python/sudoku.py
 // - examples/python/zebra.py
 
-%include <stdint.i>
+%include "stdint.i"
 
 %include "ortools/base/base.i"
 %include "ortools/util/python/proto.i"
@@ -2240,3 +2240,4 @@ class PyConstraint(Constraint):
 
 
 }  // %pythoncode
+

ortools/constraint_solver/python/routing.i

@@ -13,7 +13,6 @@
 
 // TODO(user): Refactor this file to adhere to the SWIG style guide.
 
-%include <stdint.i>
 %include "ortools/base/base.i"
 
 %include "ortools/constraint_solver/python/constraint_solver.i"