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/ns_mitm/nsmitm_web_service.cpp

@@ -34,7 +34,7 @@ Result NsWebMitmService::GetDocumentInterface(Out<std::shared_ptr<NsDocumentServ
         out_intf.ChangeObjectId(doc.s.object_id);
     }
 
-    return ResultSuccess;
+    return ResultSuccess();
 }
 
 Result NsDocumentService::GetApplicationContentPath(OutBuffer<u8> out_path, u64 app_id, u8 storage_type) {
@@ -45,7 +45,7 @@ Result NsDocumentService::ResolveApplicationContentPath(u64 title_id, u8 storage
     /* Always succeed for web applet asking about HBL. */
     if (Utils::IsWebAppletTid(static_cast<u64>(this->title_id)) && Utils::IsHblTid(title_id)) {
         nswebResolveApplicationContentPath(this->srv.get(), title_id, static_cast<FsStorageId>(storage_type));
-        return ResultSuccess;
+        return ResultSuccess();
     }
 
     return nswebResolveApplicationContentPath(this->srv.get(), title_id, static_cast<FsStorageId>(storage_type));