Deprecated function replacements

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# Deprecated function replacements

The OpenGL 3.0 specification deprecated some features, and most of these have been removed from the OpenGL 3.1 specfication and beyond. GLM provides some replacement functions. Many of these functions come from the GLM_GTC_matrix_transform: Matrix transform functions. extension.

## OpenGL function replacements

glRotate[fd]
  glm::rotate
glScale[fd]
  glm::scale
glTranslate[fd]
  glm::translate
glLoadIdentity
  The default constructor of all matrix types creates an identity matrix.
glMultMatrix[fd]
  Per the GLSL specification, the multiplication operator is overloaded for all matrix types. Multiplying two matrices together will perform matrix multiplication.
glLoadTransposeMatrix[fd]
  glm::transpose
glMultTransposeMatrix
  Combine the last two.
glFrustum
  glm::frustum
glOrtho
  glm::ortho
gluLookAt
  glm::lookAt

## GLU function replacements

gluOrtho2D
  glm::ortho
gluPerspective
  glm::perspective
gluProject
  glm::project
gluUnProject
  glm::unProject