Fully implemented lighting

Two types of light sources are currently supported: directional lights
and point lights. A scene can have only one directional light and up to
1024 point lights.

src/sideros.zig

@@ -48,7 +48,7 @@ fn init_mods() void {
 export fn sideros_init(init: api.GameInit) callconv(.c) void {
     resources = .{
         .camera = .{
-            .position = .{ -5.0, 5.0, -5.0 },
+            .position = .{ 0.0, 5.0, -5.0 },
             .target = .{ 0.0, 0.0, 0.0 },
         },
         .renderer = undefined,