(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/BaseSystem.inl

@@ -113,4 +113,17 @@ namespace Ndk
 	{
 		m_world = &world;
 	}
+
+	inline bool BaseSystem::Initialize()
+	{
+		s_nextIndex = 0;
+
+		return true;
+	}
+
+	inline void BaseSystem::Uninitialize()
+	{
+		// Rien à faire
+	}
+
 }