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/fs_mitm/fsmitm_boot0storage.hpp

@@ -72,7 +72,7 @@ class SectoredProxyStorage : public ProxyStorage {
                 }
             }
 
-            return ResultSuccess;
+            return ResultSuccess();
         }
 
         virtual Result Write(void *_buffer, size_t size, u64 offset) override {
@@ -112,7 +112,7 @@ class SectoredProxyStorage : public ProxyStorage {
                 }
             }
 
-            return ResultSuccess;
+            return ResultSuccess();
         }
 };