(NDK) Added explicit initialisation

Components and systems just can't be initialized at startup, so we need
some kind of explicit initialisation. I followed the same layout as the
others modules by adding a core class (Ndk::Sdk) which will initialize
components and systems, and Nazara's modules.

This is starting to get serious, I like it.


Former-commit-id: 263500e8d16db70ef7f92047b8a7e3235c08bcd0

SDK/include/NDK/Algorithm.hpp

@@ -14,6 +14,8 @@ namespace Ndk
 	template<unsigned int N> ComponentId BuildComponentId(const char (&name)[N]);
 	template<typename ComponentType> constexpr ComponentIndex GetComponentIndex();
 	template<typename SystemType> constexpr SystemIndex GetSystemIndex();
+	template<typename ComponentType, unsigned int N> ComponentIndex InitializeComponent(const char (&name)[N]);
+	template<typename SystemType> SystemIndex InitializeSystem();
 }
 
 #include <Ndk/Algorithm.inl>