Begin refactoring for non-NV12 support in EGLRenderer

app/shaders/egl.vert

@@ -1,10 +0,0 @@
-#version 300 es
-
-layout (location = 0) in vec2 aPosition; // 2D: X,Y
-layout (location = 1) in vec2 aTexCoord;
-out vec2 vTextCoord;
-
-void main() {
-	vTextCoord = aTexCoord;
-	gl_Position = vec4(aPosition, 0, 1);
-}