Reorganize source files into logical subdirectories

Co-authored-by: Hirek193 <23196899+Hirek193@users.noreply.github.com>

rendering/light.h

@@ -0,0 +1,23 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include "color.h"
+
+// a simple light source, either omni- or directional
+struct basic_light {
+
+    glm::vec4 ambient { colors::none };
+    glm::vec4 diffuse { colors::white };
+    glm::vec4 specular { colors::white };
+    glm::vec3 position;
+    glm::vec3 direction;
+    bool is_directional { true };
+};