feat: add model matrix transformation hierarchy and delta time tracking

src/engine/renderer/shaders/shader.h

@@ -11,6 +11,9 @@
 typedef struct {
     // Reference ID of the shader program
     GLuint ID;
+    // Location of the camera matrix uniform, set at creation
+    GLint camMatrixLocation;
+    GLint modelMatrixLocation;
 } Shader;
 
 char *get_file_contents(const char *filename);