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/sm/source/sm_user_service.cpp

@@ -25,14 +25,14 @@ namespace sts::sm {
     Result UserService::Initialize(const sf::ClientProcessId &client_process_id) {
         this->process_id = client_process_id.GetValue();
         this->has_initialized = true;
-        return ResultSuccess;
+        return ResultSuccess();
     }
 
     Result UserService::EnsureInitialized() {
         if (!this->has_initialized) {
-            return ResultSmInvalidClient;
+            return sm::ResultInvalidClient();
         }
-        return ResultSuccess;
+        return ResultSuccess();
     }
 
     Result UserService::GetService(sf::OutMoveHandle out_h, ServiceName service) {