Changing examples to use makefile

- Testing a modified version of the makefile from raylib Instead of multiple project files for examples.
- Fixed readme example

Examples/Examples/models/resources/shaders/cubemap.vs

@@ -1,28 +0,0 @@
-/*******************************************************************************************
-*
-*   rPBR [shader] - Equirectangular to cubemap vertex shader
-*
-*   Copyright (c) 2017 Victor Fisac
-*
-**********************************************************************************************/
-
-#version 330
-
-// Input vertex attributes
-in vec3 vertexPosition;
-
-// Input uniform values
-uniform mat4 projection;
-uniform mat4 view;
-
-// Output vertex attributes (to fragment shader)
-out vec3 fragPos;
-
-void main()
-{
-    // Calculate fragment position based on model transformations
-    fragPos = vertexPosition;
-
-    // Calculate final vertex position
-    gl_Position = projection*view*vec4(vertexPosition, 1.0);
-}