Adding textures capabilities

* Added Texures to the two sample cubes
* Modified mesh structure
	- mesh now contains indices and vertices
	- Vertices contain vertices and uv's (later on they will also
	contain normals)

Solution definitely not perfect and needs improvement.

BarinkEngine/graphics/shaders/fragment.shader

@@ -1,9 +1,14 @@
-#version 440 core
-
-out vec4 FragColor;
-
-uniform vec3 MatColour;
-
-void main(){
-	FragColor = vec4(MatColour, 1.0f);
+#version 440 core
+
+out vec4 FragColor;
+
+uniform vec3 Color;
+
+in vec2 TexCoord;
+
+uniform sampler2D Texture;
+
+
+void main(){
+	FragColor = mix ( texture(Texture, TexCoord), vec4(Color, 1.0f));
 }

BarinkEngine/graphics/shaders/vertex.shader

@@ -1,10 +1,15 @@
 #version 440 core
 in layout(location=0) vec3 aPos;
+in layout(location=1) vec2 uv;
+
 uniform mat4 M;
 uniform mat4 V;
 uniform mat4 P;
 
+out vec2 TexCoord;
+
 
 void main() {
+    TexCoord = uv;
     gl_Position = P * V * M * vec4(aPos.x, aPos.y, aPos.z, 1.0);
 }