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/graph/samples/SimpleMinCostFlowProgram.cs

@@ -57,11 +57,11 @@ public class SimpleMinCostFlowProgram
 
     // [START solve]
     // Find the min cost flow.
-    int solveStatus = minCostFlow.Solve();
+    MinCostFlow.Status solveStatus = minCostFlow.Solve();
     // [END solve]
 
     // [START print_solution]
-    if (solveStatus == MinCostFlow.OPTIMAL)
+    if (solveStatus == MinCostFlow.Status.OPTIMAL)
     {
       Console.WriteLine("Minimum cost: " + minCostFlow.OptimalCost());
       Console.WriteLine("");