Results: Implement namespaced, type-safe results.

Because I was working on multiple things at once, this commit also:
- Adds wrappers for/linker flags to wrap CXX exceptions to make them
  abort. This saves ~0x8000 of memory in every system module.
- Broadly replaces lines of the pattern if (cond) { return ResultX; }
  with R_UNLESS(!cond, ResultX());.
- Reworks the R_TRY_CATCH macros (and the result macros in general).

stratosphere/ams_mitm/source/set_mitm/set_mitm_service.cpp

@@ -79,7 +79,7 @@ Result SetMitmService::EnsureLocale() {
         }
     }
 
-    return ResultSuccess;
+    return ResultSuccess();
 }
 
 Result SetMitmService::GetLanguageCode(Out<u64> out_lang_code) {
@@ -90,7 +90,7 @@ Result SetMitmService::GetLanguageCode(Out<u64> out_lang_code) {
     }
 
     out_lang_code.SetValue(this->locale.language_code);
-    return ResultSuccess;
+    return ResultSuccess();
 }
 
 Result SetMitmService::GetRegionCode(Out<u32> out_region_code) {
@@ -101,5 +101,5 @@ Result SetMitmService::GetRegionCode(Out<u32> out_region_code) {
     }
 
     out_region_code.SetValue(this->locale.region_code);
-    return ResultSuccess;
+    return ResultSuccess();
 }