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_am_service.cpp

@@ -32,7 +32,7 @@ Result NsAmMitmService::ResolveApplicationContentPath(u64 title_id, u8 storage_t
     /* Always succeed for web applet asking about HBL. */
     if (Utils::IsWebAppletTid(static_cast<u64>(this->title_id)) && Utils::IsHblTid(title_id)) {
         nsamResolveApplicationContentPathFwd(this->forward_service.get(), title_id, static_cast<FsStorageId>(storage_type));
-        return ResultSuccess;
+        return ResultSuccess();
     }
 
     return nsamResolveApplicationContentPathFwd(this->forward_service.get(), title_id, static_cast<FsStorageId>(storage_type));