Rewrite the way application exits

Centralize in a single object all the global resources
management and avoid a bunch of sparse exit() calls.

This is more reliable and clean and more stick to C++ coding
practices.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/material.cpp

@@ -90,7 +90,7 @@ MaterialInfoTable::MaterialInfoTable(unsigned int numOfEntries) {
   {
       std::cerr << "Failed to allocate " << (numOfEntries * sizeof(MaterialInfo))
                 << " bytes for material hash table." << std::endl;
-      exit(EXIT_FAILURE);
+      Application::exit_with_failure();
   }
   clear();
 }