Add texture handler

Added functionality to load images as textures and bind them to meshes.

dependencies.dep

@@ -15,3 +15,7 @@ tag = v3.0.1
 git_url = https://github.com/Snaipe/Criterion.git
 tag = v2.4.2
 custom_commands = cd Criterion && meson build && cd build && ninja
+
+[stb]
+git_url = https://github.com/nothings/stb.git
+tag = master