ENT-1263 - Use MRENCLAVE instead of enclave ID in create_thread (#487)

* ENT-1263 - Use MRENCLAVE instead of enclave_id for create_thread

* ENT-1263 - Dedup dependencies in JAR

* ENT-1263 - Ensure C++ 11 is used for enclave inspection tool

* ENT-1263 - Throw exception if enclave ID mapping does not exist

sgx-jvm/jvm-enclave/common/enclave_map.cpp

@@ -0,0 +1,21 @@
+#include <cstring>
+#include <stdexcept>
+#include "enclave_map.h"
+
+static enclave_map_t map;
+
+void add_enclave_mapping(sgx_measurement_t *mr_enclave, sgx_enclave_id_t enclave_id) {
+    // Note: The size of the enclave map is proportional to the number of unique
+    // enclaves a system is dealing with. For the time being we don't envision this
+    // number to be very big. Longer term, we might want to implement some form of
+    // pruning to avoid old entries taking up unnecessary memory space.
+    map[mr_enclave] = enclave_id;
+}
+
+sgx_enclave_id_t get_enclave_id(sgx_measurement_t *mr_enclave) {
+     auto result = map.find(mr_enclave);
+     if (result == map.end()) {
+         throw std::invalid_argument("no enclave ID associated with enclave measurement");
+     }
+     return result->second;
+}