Allow user-defined TEST_PROTECT & TEST_ABORT macros

However rare, this update covers real-world use cases where:
- Unity is used to provide the assertion macros only, and an external
  test harness/runner is used for test orchestration/reporting.
- Calling longjmp on a given platform is possible, but has a
  platform-specific (or implementation-specific) set of prerequisites,
e.g. privileged access level.

Enable project-specific customisation of TEST_PROTECT and TEST_ABORT
macros.
- Use the user-defined UNITY_TEST_ABORT if available; fall back to
  default behaviour otherwise.
- Use the user-defined UNITY_TEST_PROTECT if available; fall back to
  default behaviour otherwise.
- These may be defined independently.

src/unity_internals.h

@@ -759,13 +759,25 @@ extern const char UnityStrErrShorthand[];
  * Test Running Macros
  *-------------------------------------------------------*/
 
+#ifdef UNITY_TEST_PROTECT
+#define TEST_PROTECT() UNITY_TEST_PROTECT()
+#else
 #ifndef UNITY_EXCLUDE_SETJMP_H
 #define TEST_PROTECT() (setjmp(Unity.AbortFrame) == 0)
-#define TEST_ABORT() longjmp(Unity.AbortFrame, 1)
 #else
 #define TEST_PROTECT() 1
+#endif
+#endif
+
+#ifdef UNITY_TEST_ABORT
+#define TEST_ABORT() UNITY_TEST_ABORT()
+#else
+#ifndef UNITY_EXCLUDE_SETJMP_H
+#define TEST_ABORT() longjmp(Unity.AbortFrame, 1)
+#else
 #define TEST_ABORT() return
 #endif
+#endif
 
 /* Automatically enable variadic macros support, if it not enabled before */
 #ifndef UNITY_SUPPORT_VARIADIC_MACROS