[core][rlgl] Redesign Shaders/Textures system, use Materials about raylib HOT 6 CLOSED

Implemented in commit c9d22c7

Still some work required to improve new struct Material usage...

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Directly related to issue #96

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Standard Material/Lighting system update 01: c60cc9e
Standard Material/Lighting system update 02: 80eb4f3

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Answering 9811a37 commit description: "It seems there are some problems with DrawLights()"

I think DrawLights() is correct. It draws:

• Point light: sphere wires.
• Directional light: it draws a sphere wire in its position and cube wires in target position. To set up a directional light, you just have to set up the direction vector that uses the standard shader by subtract target - position (it's the same position(0, 0, 0) target(0, 1, 0) than position (1, 1, 1,) target (1, 2, 1))... I used that way because I think is more simple and visually easy to understand light parameters (and 3D Max uses that way).
• Spot light: it draws a cone in its position (axis oriented) and a cube wires in target position....

So, I didn't see any problem in DrawLights().

But, I have seen another problem... Sometimes, if I move the lights variables definitions to a different order (using current order of the example works fine), there is a light that is not sent to shader or something because you cannot see its effect in the model. I don't know where is the issue: CreateLight() or SetShaderLights()...

I will review it before adding shader maps feature.

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Closed by pull request 4b93349

Many thanks to @victorfisac for his amazing work!

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You are welcome @raysan5 . It will be improved over time.

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