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/libstratosphere/include/stratosphere/ievent.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include <switch.h>
+#include <algorithm>
 #include <vector>
 
 #include "iwaitable.hpp"
@@ -22,9 +23,7 @@ class IEvent : public IWaitable {
         }
         
         ~IEvent() {
-            for (auto &h : this->handles) {
-                svcCloseHandle(h);
-            }
+            std::for_each(handles.begin(), handles.end(), svcCloseHandle);
         }
         
         virtual Result signal_event() = 0;
@@ -50,4 +49,4 @@ class IEvent : public IWaitable {
             /* TODO: Panic. */
             return 0xCAFE;
         } 
-};
+};