Modernize C++ usage (#144)

* Stratosphere: Use modern C++ idioms in some places

* algorithms like std::for_each are used instead of raw loops

* Stratosphere: Replace more raw loops with algorithms

* Stratosphere: Add a utility predicate function to test for equality with a reference element

This can be used to rewrite some common raw loops using algorithms instead

* fs.mitm: Use variant

* fs.mitm: Use enum class

* fs.mitm: Turn RomFSSourceInfo::Cleanup into a destructor

This obsoletes the need for a custom deleter in other places

* fs.mitm: Use enum class some more

* fs.mitm: Use unique_ptr

* fs.mitm: Simplify initialization

* Stratosphere: Simplify initialization

* fs.mitm: Use unique_ptr (fix memory leak along the way)

The previous code was using "delete" rather than "delete[]"

* fs.mitm: Use vector::emplace_back rather than push_back

emplace_back constructs elements in-place, hence avoiding a redundant element copy.

* Stratosphere: Replace more raw loops with algorithms

* Stratosphere: Use unique_ptr

* fs.mitm: Replace more raw loops with algorithms

* Stratosphere: Prefer move-construction over copy-construction when moving sink parameters around

stratosphere/loader/source/ldr_registration.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include <switch.h>
+#include <array>
 
 #include "ldr_map.hpp"
 
@@ -48,14 +49,14 @@ class Registration {
             u64 process_id;
             u64 title_id;
             Registration::TidSid tid_sid;
-            Registration::NsoInfoHolder nso_infos[NSO_INFO_MAX];
-            Registration::NroInfo nro_infos[NRO_INFO_MAX];
-            MappedCodeMemory nrr_infos[NRR_INFO_MAX];
+            std::array<Registration::NsoInfoHolder, NSO_INFO_MAX> nso_infos;
+            std::array<Registration::NroInfo, NRO_INFO_MAX> nro_infos;
+            std::array<MappedCodeMemory, NRR_INFO_MAX> nrr_infos;
             void *owner_ro_service;
         };
         
         struct List {
-            Registration::Process processes[REGISTRATION_LIST_MAX];
+            std::array<Registration::Process, REGISTRATION_LIST_MAX> processes;
             u64 num_processes;
         };