Added clickable buttons; Custom button textures can be specified; Added default cubemap

NFPackCreator/AssetBuild/base/shaders/cubemapFragment.shader

@@ -9,7 +9,7 @@ out vec4 color;
 void main() {
 	vec3 tc;
 	tc = vec3(-texCoord.x, texCoord.y, texCoord.z);
-	if (texCoord.y > 0.99 || texCoord.y < -0.99) {
+	if (texCoord.y > 0.999999 || texCoord.y < -0.999999) {
 		tc = vec3(texCoord.x, texCoord.y, texCoord.z);
 	}
 	color = texture(cm, tc);