Update EDEn's graphical code to use the modern programmable OpenGL pipeline

[noam-c]

Currently, EDEn makes heavy use of outdated immediate mode OpenGL to draw all of its graphics. This adversely affects the game's performance, and also makes graphical effects much harder to write than is really necessary.

Using the programmable pipeline would allow EDEn to make better use of the player's graphics hardware, while allowing EDEn developers to more quickly and easily add support for a variety of graphical effects to simulate magic spells, weather, and other phenomena.

[noam-c]

The high-level view of the programmable pipeline isn't so daunting, but transitioning a project from the fixed pipeline is a challenge in and of itself. I'm still determining the right set of things to do, but this is the beginning of that to-do list:

• [x] Switch to GLEW (no need to reinvent extension locating)
• [ ] Replace quad-drawing code with VBOs
• [ ] Add glm for matrix math
• [ ] Use glm and shaders to replace glTranslate and glOrtho calls
• [ ] Update layer drawing code to cache results in some way (screen buffer or VBO)
• [ ] Replace texture binds with shader
• [ ] Update Transition classes to use shaders