Added new methods to set uniforms in sf::Shader

Implements a new design for the shader uniform API.
* Added Shader::setUniform() and Shader::setUniformArray() overloads for the following types:
  -> scalars: float, int, bool
  -> vectors: 2D, 3D, 4D
  -> matrices: 3x3, 4x4
  -> arrays of basic types
  -> samplers (sf::Texture)
  -> conversions for SFML types (sf::Transform, sf::Color)
* Added sf::Glsl namespace with GLSL-equivalent types
* Deprecated Shader::setParameter() overloads

Other related changes:
* Refactored sf::Shader internals to avoid code duplication
* Improved documentation
* Added SFML_DEPRECATED macro to Doxyfile
* Defined _SCL_SECURE_NO_WARNINGS to disable std::copy() warnings on MSVC

include/SFML/Graphics/Glsl.inl

@@ -0,0 +1,152 @@
+////////////////////////////////////////////////////////////
+//
+// SFML - Simple and Fast Multimedia Library
+// Copyright (C) 2007-2015 Laurent Gomila (laurent@sfml-dev.org)
+//
+// This software is provided 'as-is', without any express or implied warranty.
+// In no event will the authors be held liable for any damages arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it freely,
+// subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented;
+//    you must not claim that you wrote the original software.
+//    If you use this software in a product, an acknowledgment
+//    in the product documentation would be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such,
+//    and must not be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source distribution.
+//
+////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////
+/// \brief Helper functions to copy sf::Transform to sf::Glsl::Mat3/4
+///
+////////////////////////////////////////////////////////////
+void copyMatrix(const Transform& source, Matrix<3, 3>& dest);
+void copyMatrix(const Transform& source, Matrix<4, 4>& dest);
+
+////////////////////////////////////////////////////////////
+/// \brief Copy array-based matrix with given number of elements
+///
+/// Indirection to std::copy() to avoid inclusion of
+/// <algorithm> and MSVC's annoying 4996 warning in header
+///
+////////////////////////////////////////////////////////////
+void copyMatrix(const float* source, std::size_t elements, float* dest);
+
+////////////////////////////////////////////////////////////
+/// \brief Helper functions to copy sf::Color to sf::Glsl::Vec4/Ivec4
+///
+////////////////////////////////////////////////////////////
+void copyVector(const Color& source, Vector4<float>& dest);
+void copyVector(const Color& source, Vector4<int>& dest);
+
+
+////////////////////////////////////////////////////////////
+/// \brief Matrix type, used to set uniforms in GLSL
+///
+////////////////////////////////////////////////////////////
+template <std::size_t Columns, std::size_t Rows>
+struct Matrix
+{
+    ////////////////////////////////////////////////////////////
+    /// \brief Construct from raw data
+    ///
+    /// \param pointer Points to the beginning of an array that
+    ///                has the size of the matrix. The elements
+    ///                are copied to the instance.
+    ///
+    ////////////////////////////////////////////////////////////
+    explicit Matrix(const float* pointer)
+    {
+        copyMatrix(pointer, Columns * Rows, array);
+    }
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Construct implicitly from SFML transform
+    ///
+    /// This constructor is only supported for 3x3 and 4x4
+    /// matrices.
+    ///
+    /// \param transform Object containing a transform.
+    ///
+    ////////////////////////////////////////////////////////////
+    Matrix(const Transform& transform)
+    {
+        copyMatrix(transform, *this);
+    }
+
+    float array[Columns * Rows]; ///< Array holding matrix data
+};
+
+////////////////////////////////////////////////////////////
+/// \brief 4D vector type, used to set uniforms in GLSL
+///
+////////////////////////////////////////////////////////////
+template <typename T>
+struct Vector4
+{
+    ////////////////////////////////////////////////////////////
+    /// \brief Default constructor, creates a zero vector
+    ///
+    ////////////////////////////////////////////////////////////
+    Vector4() :
+    x(0),
+    y(0),
+    z(0),
+    w(0)
+    {
+    }
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Construct from 4 vector components
+    ///
+    /// \param X,Y,Z,W Components of the 4D vector
+    ///
+    ////////////////////////////////////////////////////////////
+    Vector4(T X, T Y, T Z, T W) :
+    x(X),
+    y(Y),
+    z(Z),
+    w(W)
+    {
+    }
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Conversion constructor
+    ///
+    /// \param other 4D vector of different type
+    ///
+    ////////////////////////////////////////////////////////////
+    template <typename U>
+    explicit Vector4(const Vector4<U>& other) :
+    x(static_cast<T>(other.x)),
+    y(static_cast<T>(other.y)),
+    z(static_cast<T>(other.z)),
+    w(static_cast<T>(other.w))
+    {
+    }
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Construct float vector implicitly from color
+    ///
+    /// \param color Color instance. Is normalized to [0, 1]
+    ///              for floats, and left as-is for ints.
+    ///
+    ////////////////////////////////////////////////////////////
+    Vector4(const Color& color)
+    // uninitialized
+    {
+        copyVector(color, *this);
+    }
+
+    T x; ///< 1st component (X) of the 4D vector
+    T y; ///< 2nd component (Y) of the 4D vector
+    T z; ///< 3rd component (Z) of the 4D vector
+    T w; ///< 4th component (W) of the 4D vector
+};