Factor out more resources.

+ Use QOpenGLShader to get compiled shader code in TreeView.
+ Remove last remaining Qt resources dependency in libqtk.
+ shaders.h in libqtk to define default GLSL shader programs.

resources/shaders/vertex/model-basic.vert

@@ -1,16 +0,0 @@
-#version 330 core
-layout (location = 0) in vec3 aPosition;
-layout (location = 1) in vec3 aNormal;
-layout (location = 2) in vec2 aTextureCoord;
-
-out vec2 vTextureCoord;
-
-uniform mat4 uModel;
-uniform mat4 uView;
-uniform mat4 uProjection;
-
-void main()
-{
-    vTextureCoord = aTextureCoord;
-    gl_Position = uProjection * uView * uModel * vec4(aPosition, 1.0);
-}

resources/shaders/vertex/multi-color.vert

@@ -1,16 +0,0 @@
-#version 330
-layout(location = 0) in vec3 aPosition;
-layout(location = 1) in vec3 aColor;
-
-out vec4 vColor;
-
-uniform mat4 uModel;  // Model
-uniform mat4 uView; // View
-uniform mat4 uProjection;  // Projection
-
-void main()
-{
-  gl_Position = uProjection * uView * uModel * vec4(aPosition, 1.0);
-
-  vColor = vec4(aColor, 1.0f);
-}