abort/error: print backtrace, abuse templates, overhaul result/diag (macos not done yet)

exosphere/program/sc7fw/source/sc7fw_main.cpp

@@ -111,7 +111,7 @@ namespace ams::sc7fw {
 
 namespace ams::diag {
 
-    void AbortImpl() {
+    NORETURN void AbortImpl() {
         sc7fw::ExceptionHandler();
     }