Models all tested and refactored so that the draw() call doesn't do a bunch of irrelevant shit.

14-refactor/tests/model_tests.cpp

@@ -6,6 +6,9 @@
 
 using namespace fuc2;
 
+/*
+ * This also tests Mesh by using Model to load them.
+ */
 namespace model_tests {
   void test_load_textures() {
     Shader shader{"shaders/14-vert.glsl", "shaders/14-frag.glsl"};