First part of render texture commit

Added NzContext::EnsureContext and NzContext::GetThreadContext
Added NzCube
Added NzRect::GetCenter
Added methods to send vectors to shaders
Added NzRenderer::SetViewport
Fixed NzRect::ExtendTo calculations
Fixed NzImage::Update checks with level > 0
No longer use glTexStorage when creating a texture to prevent a bug
NzBuffer's Lock and Unlock operations renamed to Map and Unmap
NzVector2/3/4 can now cast implicitly to a pointer
Optimized compilation time of String.hpp
Optimized normalisaton of quaternions
Optimized passing uniforms to shaders
Quaternion now automaticaly Normalize h
Removed macro definition of NAZARA_RENDERER_OPENGL from Renderer
Removed implicit cast from NzVector2/3/4 to NzString
Renamed nzBufferLock to nzBufferAccess
Renamed NzRenderTarget::CanActivate to IsValid

src/Nazara/Core/MemoryStream.cpp

@@ -8,7 +8,7 @@
 #include <Nazara/Core/Debug.hpp>
 
 NzMemoryStream::NzMemoryStream(const void* ptr, nzUInt64 size) :
-m_ptr(static_cast<const nzUInt8*>(ptr)),
+m_ptr(reinterpret_cast<const nzUInt8*>(ptr)),
 m_pos(0),
 m_size(size)
 {