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/setsys_mitm_service.cpp

@@ -32,7 +32,7 @@ Result SetSysMitmService::GetFirmwareVersion(OutPointerWithServerSize<SetSysFirm
     /* GetFirmwareVersion sanitizes these fields. */
     out.pointer->revision_major = 0;
     out.pointer->revision_minor = 0;
-    return ResultSuccess;
+    return ResultSuccess();
 }
 
 Result SetSysMitmService::GetFirmwareVersion2(OutPointerWithServerSize<SetSysFirmwareVersion, 0x1> out) {
@@ -64,7 +64,7 @@ Result SetSysMitmService::GetSettingsItemValueSize(Out<u64> out_size, InPointer<
         R_TRY(setsysGetSettingsItemValueSize(name, key, out_size.GetPointer()));
     }
 
-    return ResultSuccess;
+    return ResultSuccess();
 }
 
 Result SetSysMitmService::GetSettingsItemValue(Out<u64> out_size, OutBuffer<u8> out_value, InPointer<char> in_name, InPointer<char> in_key) {
@@ -96,5 +96,5 @@ Result SetSysMitmService::GetSettingsItemValue(Out<u64> out_size, OutBuffer<u8>
         R_TRY(setsysGetSettingsItemValueFwd(this->forward_service.get(), name, key, out_value.buffer, out_value.num_elements, out_size.GetPointer()));
     }
 
-    return ResultSuccess;
+    return ResultSuccess();
 }